Rename set_equality within update_claims_view_from_matched_txn
[rust-lightning] / lightning / src / ln / functional_tests.rs
index b0b51bfe8628c20db50d5cf247055bb0abb0df1a..79c85e75447d5bb959ef391c5941d0d62db933ff 100644 (file)
 //! payments/messages between them, and often checking the resulting ChannelMonitors are able to
 //! claim outputs on-chain.
 
-use chain;
-use chain::{Confirm, Listen, Watch};
-use chain::chaininterface::LowerBoundedFeeEstimator;
-use chain::channelmonitor;
-use chain::channelmonitor::{ChannelMonitor, CLTV_CLAIM_BUFFER, LATENCY_GRACE_PERIOD_BLOCKS, ANTI_REORG_DELAY};
-use chain::transaction::OutPoint;
-use chain::keysinterface::{BaseSign, KeysInterface};
-use ln::{PaymentPreimage, PaymentSecret, PaymentHash};
-use ln::channel::{commitment_tx_base_weight, COMMITMENT_TX_WEIGHT_PER_HTLC, CONCURRENT_INBOUND_HTLC_FEE_BUFFER, FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE, MIN_AFFORDABLE_HTLC_COUNT};
-use ln::channelmanager::{self, ChannelManager, ChannelManagerReadArgs, PaymentId, RAACommitmentOrder, PaymentSendFailure, BREAKDOWN_TIMEOUT, MIN_CLTV_EXPIRY_DELTA, PAYMENT_EXPIRY_BLOCKS};
-use ln::channel::{Channel, ChannelError};
-use ln::{chan_utils, onion_utils};
-use ln::chan_utils::{OFFERED_HTLC_SCRIPT_WEIGHT, htlc_success_tx_weight, htlc_timeout_tx_weight, HTLCOutputInCommitment};
-use routing::gossip::{NetworkGraph, NetworkUpdate};
-use routing::router::{PaymentParameters, Route, RouteHop, RouteParameters, find_route, get_route};
-use ln::features::{ChannelFeatures, NodeFeatures};
-use ln::msgs;
-use ln::msgs::{ChannelMessageHandler, RoutingMessageHandler, ErrorAction};
-use util::enforcing_trait_impls::EnforcingSigner;
-use util::{byte_utils, test_utils};
-use util::events::{Event, MessageSendEvent, MessageSendEventsProvider, PaymentPurpose, ClosureReason, HTLCDestination};
-use util::errors::APIError;
-use util::ser::{Writeable, ReadableArgs};
-use util::config::UserConfig;
+use crate::chain;
+use crate::chain::{ChannelMonitorUpdateStatus, Confirm, Listen, Watch};
+use crate::chain::chaininterface::LowerBoundedFeeEstimator;
+use crate::chain::channelmonitor;
+use crate::chain::channelmonitor::{CLTV_CLAIM_BUFFER, LATENCY_GRACE_PERIOD_BLOCKS, ANTI_REORG_DELAY};
+use crate::chain::transaction::OutPoint;
+use crate::chain::keysinterface::{BaseSign, KeysInterface};
+use crate::ln::{PaymentPreimage, PaymentSecret, PaymentHash};
+use crate::ln::channel::{commitment_tx_base_weight, COMMITMENT_TX_WEIGHT_PER_HTLC, CONCURRENT_INBOUND_HTLC_FEE_BUFFER, FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE, MIN_AFFORDABLE_HTLC_COUNT};
+use crate::ln::channelmanager::{self, PaymentId, RAACommitmentOrder, PaymentSendFailure, BREAKDOWN_TIMEOUT, MIN_CLTV_EXPIRY_DELTA};
+use crate::ln::channel::{Channel, ChannelError};
+use crate::ln::{chan_utils, onion_utils};
+use crate::ln::chan_utils::{OFFERED_HTLC_SCRIPT_WEIGHT, htlc_success_tx_weight, htlc_timeout_tx_weight, HTLCOutputInCommitment};
+use crate::routing::gossip::{NetworkGraph, NetworkUpdate};
+use crate::routing::router::{PaymentParameters, Route, RouteHop, RouteParameters, find_route, get_route};
+use crate::ln::features::{ChannelFeatures, NodeFeatures};
+use crate::ln::msgs;
+use crate::ln::msgs::{ChannelMessageHandler, RoutingMessageHandler, ErrorAction};
+use crate::util::enforcing_trait_impls::EnforcingSigner;
+use crate::util::test_utils;
+use crate::util::events::{Event, MessageSendEvent, MessageSendEventsProvider, PaymentPurpose, ClosureReason, HTLCDestination};
+use crate::util::errors::APIError;
+use crate::util::ser::{Writeable, ReadableArgs};
+use crate::util::config::UserConfig;
 
 use bitcoin::hash_types::BlockHash;
 use bitcoin::blockdata::block::{Block, BlockHeader};
@@ -50,21 +50,21 @@ use bitcoin::secp256k1::{PublicKey,SecretKey};
 
 use regex;
 
-use io;
-use prelude::*;
+use crate::io;
+use crate::prelude::*;
 use alloc::collections::BTreeSet;
 use core::default::Default;
 use core::iter::repeat;
 use bitcoin::hashes::Hash;
-use sync::{Arc, Mutex};
+use crate::sync::Mutex;
 
-use ln::functional_test_utils::*;
-use ln::chan_utils::CommitmentTransaction;
+use crate::ln::functional_test_utils::*;
+use crate::ln::chan_utils::CommitmentTransaction;
 
 #[test]
 fn test_insane_channel_opens() {
        // Stand up a network of 2 nodes
-       use ln::channel::TOTAL_BITCOIN_SUPPLY_SATOSHIS;
+       use crate::ln::channel::TOTAL_BITCOIN_SUPPLY_SATOSHIS;
        let mut cfg = UserConfig::default();
        cfg.channel_handshake_limits.max_funding_satoshis = TOTAL_BITCOIN_SUPPLY_SATOSHIS + 1;
        let chanmon_cfgs = create_chanmon_cfgs(2);
@@ -101,7 +101,7 @@ fn test_insane_channel_opens() {
                } else { assert!(false); }
        };
 
-       use ln::channelmanager::MAX_LOCAL_BREAKDOWN_TIMEOUT;
+       use crate::ln::channelmanager::MAX_LOCAL_BREAKDOWN_TIMEOUT;
 
        // Test all mutations that would make the channel open message insane
        insane_open_helper(format!("Per our config, funding must be at most {}. It was {}", TOTAL_BITCOIN_SUPPLY_SATOSHIS + 1, TOTAL_BITCOIN_SUPPLY_SATOSHIS + 2).as_str(), |mut msg| { msg.funding_satoshis = TOTAL_BITCOIN_SUPPLY_SATOSHIS + 2; msg });
@@ -126,7 +126,7 @@ fn test_insane_channel_opens() {
 fn test_funding_exceeds_no_wumbo_limit() {
        // Test that if a peer does not support wumbo channels, we'll refuse to open a wumbo channel to
        // them.
-       use ln::channel::MAX_FUNDING_SATOSHIS_NO_WUMBO;
+       use crate::ln::channel::MAX_FUNDING_SATOSHIS_NO_WUMBO;
        let chanmon_cfgs = create_chanmon_cfgs(2);
        let mut node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
        node_cfgs[1].features = channelmanager::provided_init_features().clear_wumbo();
@@ -253,7 +253,7 @@ fn test_async_inbound_update_fee() {
 
        // ...but before it's delivered, nodes[1] starts to send a payment back to nodes[0]...
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], 40000);
-       nodes[1].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[1].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
        check_added_monitors!(nodes[1], 1);
 
        let payment_event = {
@@ -352,7 +352,7 @@ fn test_update_fee_unordered_raa() {
 
        // ...but before it's delivered, nodes[1] starts to send a payment back to nodes[0]...
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], 40000);
-       nodes[1].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[1].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
        check_added_monitors!(nodes[1], 1);
 
        let payment_event = {
@@ -558,6 +558,7 @@ fn do_test_sanity_on_in_flight_opens(steps: u8) {
        confirm_transaction_at(&nodes[0], &tx, 2);
        connect_blocks(&nodes[0], CHAN_CONFIRM_DEPTH);
        create_chan_between_nodes_with_value_confirm_second(&nodes[1], &nodes[0]);
+       expect_channel_ready_event(&nodes[0], &nodes[1].node.get_our_node_id());
 }
 
 #[test]
@@ -704,7 +705,7 @@ fn test_update_fee_that_funder_cannot_afford() {
 
        // Assemble the set of keys we can use for signatures for our commitment_signed message.
        let commit_tx_keys = chan_utils::TxCreationKeys::derive_new(&secp_ctx, &remote_point, &remote_delayed_payment_basepoint,
-               &remote_htlc_basepoint, &local_revocation_basepoint, &local_htlc_basepoint).unwrap();
+               &remote_htlc_basepoint, &local_revocation_basepoint, &local_htlc_basepoint);
 
        let res = {
                let local_chan_lock = nodes[0].node.channel_state.lock().unwrap();
@@ -781,7 +782,7 @@ fn test_update_fee_with_fundee_update_add_htlc() {
        let (route, our_payment_hash, our_payment_preimage, our_payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], 800000);
 
        // nothing happens since node[1] is in AwaitingRemoteRevoke
-       nodes[1].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[1].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
        {
                let mut added_monitors = nodes[0].chain_monitor.added_monitors.lock().unwrap();
                assert_eq!(added_monitors.len(), 0);
@@ -833,7 +834,7 @@ fn test_update_fee_with_fundee_update_add_htlc() {
        let events = nodes[0].node.get_and_clear_pending_events();
        assert_eq!(events.len(), 1);
        match events[0] {
-               Event::PaymentReceived { .. } => { },
+               Event::PaymentClaimable { .. } => { },
                _ => panic!("Unexpected event"),
        };
 
@@ -1091,9 +1092,9 @@ fn holding_cell_htlc_counting() {
        let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 
        let mut payments = Vec::new();
-       for _ in 0..::ln::channel::OUR_MAX_HTLCS {
+       for _ in 0..crate::ln::channel::OUR_MAX_HTLCS {
                let (route, payment_hash, payment_preimage, payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[2], 100000);
-               nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
+               nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret), PaymentId(payment_hash.0)).unwrap();
                payments.push((payment_preimage, payment_hash));
        }
        check_added_monitors!(nodes[1], 1);
@@ -1108,7 +1109,7 @@ fn holding_cell_htlc_counting() {
        // another HTLC.
        let (route, payment_hash_1, _, payment_secret_1) = get_route_and_payment_hash!(nodes[1], nodes[2], 100000);
        {
-               unwrap_send_err!(nodes[1].node.send_payment(&route, payment_hash_1, &Some(payment_secret_1)), true, APIError::ChannelUnavailable { ref err },
+               unwrap_send_err!(nodes[1].node.send_payment(&route, payment_hash_1, &Some(payment_secret_1), PaymentId(payment_hash_1.0)), true, APIError::ChannelUnavailable { ref err },
                        assert!(regex::Regex::new(r"Cannot push more than their max accepted HTLCs \(\d+\)").unwrap().is_match(err)));
                assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
                nodes[1].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "Cannot push more than their max accepted HTLCs".to_string(), 1);
@@ -1117,7 +1118,7 @@ fn holding_cell_htlc_counting() {
        // This should also be true if we try to forward a payment.
        let (route, payment_hash_2, _, payment_secret_2) = get_route_and_payment_hash!(nodes[0], nodes[2], 100000);
        {
-               nodes[0].node.send_payment(&route, payment_hash_2, &Some(payment_secret_2)).unwrap();
+               nodes[0].node.send_payment(&route, payment_hash_2, &Some(payment_secret_2), PaymentId(payment_hash_2.0)).unwrap();
                check_added_monitors!(nodes[0], 1);
        }
 
@@ -1178,7 +1179,7 @@ fn holding_cell_htlc_counting() {
        assert_eq!(events.len(), payments.len());
        for (event, &(_, ref hash)) in events.iter().zip(payments.iter()) {
                match event {
-                       &Event::PaymentReceived { ref payment_hash, .. } => {
+                       &Event::PaymentClaimable { ref payment_hash, .. } => {
                                assert_eq!(*payment_hash, *hash);
                        },
                        _ => panic!("Unexpected event"),
@@ -1330,9 +1331,9 @@ fn test_basic_channel_reserve() {
        let commit_tx_fee = 2 * commit_tx_fee_msat(get_feerate!(nodes[0], chan.2), 1 + 1, get_opt_anchors!(nodes[0], chan.2));
        let max_can_send = 5000000 - channel_reserve - commit_tx_fee;
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], max_can_send + 1);
-       let err = nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).err().unwrap();
+       let err = nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).err().unwrap();
        match err {
-               PaymentSendFailure::AllFailedRetrySafe(ref fails) => {
+               PaymentSendFailure::AllFailedResendSafe(ref fails) => {
                        match &fails[0] {
                                &APIError::ChannelUnavailable{ref err} =>
                                        assert!(regex::Regex::new(r"Cannot send value that would put our balance under counterparty-announced channel reserve value \(\d+\)").unwrap().is_match(err)),
@@ -1411,7 +1412,7 @@ fn test_fee_spike_violation_fails_htlc() {
 
        // Assemble the set of keys we can use for signatures for our commitment_signed message.
        let commit_tx_keys = chan_utils::TxCreationKeys::derive_new(&secp_ctx, &remote_point, &remote_delayed_payment_basepoint,
-               &remote_htlc_basepoint, &local_revocation_basepoint, &local_htlc_basepoint).unwrap();
+               &remote_htlc_basepoint, &local_revocation_basepoint, &local_htlc_basepoint);
 
        // Build the remote commitment transaction so we can sign it, and then later use the
        // signature for the commitment_signed message.
@@ -1506,7 +1507,7 @@ fn test_chan_reserve_violation_outbound_htlc_inbound_chan() {
 
        // However one more HTLC should be significantly over the reserve amount and fail.
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], 1_000_000);
-       unwrap_send_err!(nodes[1].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
+       unwrap_send_err!(nodes[1].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)), true, APIError::ChannelUnavailable { ref err },
                assert_eq!(err, "Cannot send value that would put counterparty balance under holder-announced channel reserve value"));
        assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
        nodes[1].logger.assert_log("lightning::ln::channelmanager".to_string(), "Cannot send value that would put counterparty balance under holder-announced channel reserve value".to_string(), 1);
@@ -1597,7 +1598,7 @@ fn test_chan_reserve_dust_inbound_htlcs_outbound_chan() {
 
        // One more than the dust amt should fail, however.
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], dust_amt + 1);
-       unwrap_send_err!(nodes[1].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
+       unwrap_send_err!(nodes[1].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)), true, APIError::ChannelUnavailable { ref err },
                assert_eq!(err, "Cannot send value that would put counterparty balance under holder-announced channel reserve value"));
 }
 
@@ -1691,7 +1692,7 @@ fn test_chan_reserve_violation_inbound_htlc_inbound_chan() {
        // Add a pending HTLC.
        let (route_1, our_payment_hash_1, _, our_payment_secret_1) = get_route_and_payment_hash!(nodes[0], nodes[2], amt_msat_1);
        let payment_event_1 = {
-               nodes[0].node.send_payment(&route_1, our_payment_hash_1, &Some(our_payment_secret_1)).unwrap();
+               nodes[0].node.send_payment(&route_1, our_payment_hash_1, &Some(our_payment_secret_1), PaymentId(our_payment_hash_1.0)).unwrap();
                check_added_monitors!(nodes[0], 1);
 
                let mut events = nodes[0].node.get_and_clear_pending_msg_events();
@@ -1801,7 +1802,7 @@ fn test_channel_reserve_holding_cell_htlcs() {
                route.paths[0].last_mut().unwrap().fee_msat += 1;
                assert!(route.paths[0].iter().rev().skip(1).all(|h| h.fee_msat == feemsat));
 
-               unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
+               unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)), true, APIError::ChannelUnavailable { ref err },
                        assert!(regex::Regex::new(r"Cannot send value that would put us over the max HTLC value in flight our peer will accept \(\d+\)").unwrap().is_match(err)));
                assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
                nodes[0].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "Cannot send value that would put us over the max HTLC value in flight our peer will accept".to_string(), 1);
@@ -1857,7 +1858,7 @@ fn test_channel_reserve_holding_cell_htlcs() {
 
        let (route_1, our_payment_hash_1, our_payment_preimage_1, our_payment_secret_1) = get_route_and_payment_hash!(nodes[0], nodes[2], recv_value_1);
        let payment_event_1 = {
-               nodes[0].node.send_payment(&route_1, our_payment_hash_1, &Some(our_payment_secret_1)).unwrap();
+               nodes[0].node.send_payment(&route_1, our_payment_hash_1, &Some(our_payment_secret_1), PaymentId(our_payment_hash_1.0)).unwrap();
                check_added_monitors!(nodes[0], 1);
 
                let mut events = nodes[0].node.get_and_clear_pending_msg_events();
@@ -1870,7 +1871,7 @@ fn test_channel_reserve_holding_cell_htlcs() {
        let recv_value_2 = stat01.value_to_self_msat - amt_msat_1 - stat01.channel_reserve_msat - total_fee_msat - commit_tx_fee_2_htlcs;
        {
                let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[2], recv_value_2 + 1);
-               unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
+               unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)), true, APIError::ChannelUnavailable { ref err },
                        assert!(regex::Regex::new(r"Cannot send value that would put our balance under counterparty-announced channel reserve value \(\d+\)").unwrap().is_match(err)));
                assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
        }
@@ -1888,7 +1889,7 @@ fn test_channel_reserve_holding_cell_htlcs() {
        // now see if they go through on both sides
        let (route_21, our_payment_hash_21, our_payment_preimage_21, our_payment_secret_21) = get_route_and_payment_hash!(nodes[0], nodes[2], recv_value_21);
        // but this will stuck in the holding cell
-       nodes[0].node.send_payment(&route_21, our_payment_hash_21, &Some(our_payment_secret_21)).unwrap();
+       nodes[0].node.send_payment(&route_21, our_payment_hash_21, &Some(our_payment_secret_21), PaymentId(our_payment_hash_21.0)).unwrap();
        check_added_monitors!(nodes[0], 0);
        let events = nodes[0].node.get_and_clear_pending_events();
        assert_eq!(events.len(), 0);
@@ -1896,7 +1897,7 @@ fn test_channel_reserve_holding_cell_htlcs() {
        // test with outbound holding cell amount > 0
        {
                let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[2], recv_value_22+1);
-               unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
+               unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)), true, APIError::ChannelUnavailable { ref err },
                        assert!(regex::Regex::new(r"Cannot send value that would put our balance under counterparty-announced channel reserve value \(\d+\)").unwrap().is_match(err)));
                assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
                nodes[0].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "Cannot send value that would put our balance under counterparty-announced channel reserve value".to_string(), 2);
@@ -1904,7 +1905,7 @@ fn test_channel_reserve_holding_cell_htlcs() {
 
        let (route_22, our_payment_hash_22, our_payment_preimage_22, our_payment_secret_22) = get_route_and_payment_hash!(nodes[0], nodes[2], recv_value_22);
        // this will also stuck in the holding cell
-       nodes[0].node.send_payment(&route_22, our_payment_hash_22, &Some(our_payment_secret_22)).unwrap();
+       nodes[0].node.send_payment(&route_22, our_payment_hash_22, &Some(our_payment_secret_22), PaymentId(our_payment_hash_22.0)).unwrap();
        check_added_monitors!(nodes[0], 0);
        assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
        assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
@@ -1935,7 +1936,7 @@ fn test_channel_reserve_holding_cell_htlcs() {
        commitment_signed_dance!(nodes[2], nodes[1], payment_event_11.commitment_msg, false);
 
        expect_pending_htlcs_forwardable!(nodes[2]);
-       expect_payment_received!(nodes[2], our_payment_hash_1, our_payment_secret_1, recv_value_1);
+       expect_payment_claimable!(nodes[2], our_payment_hash_1, our_payment_secret_1, recv_value_1);
 
        // flush the htlcs in the holding cell
        assert_eq!(commitment_update_2.update_add_htlcs.len(), 2);
@@ -1955,9 +1956,11 @@ fn test_channel_reserve_holding_cell_htlcs() {
        let events = nodes[2].node.get_and_clear_pending_events();
        assert_eq!(events.len(), 2);
        match events[0] {
-               Event::PaymentReceived { ref payment_hash, ref purpose, amount_msat } => {
+               Event::PaymentClaimable { ref payment_hash, ref purpose, amount_msat, receiver_node_id, via_channel_id, via_user_channel_id: _ } => {
                        assert_eq!(our_payment_hash_21, *payment_hash);
                        assert_eq!(recv_value_21, amount_msat);
+                       assert_eq!(nodes[2].node.get_our_node_id(), receiver_node_id.unwrap());
+                       assert_eq!(via_channel_id, Some(chan_2.2));
                        match &purpose {
                                PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
                                        assert!(payment_preimage.is_none());
@@ -1969,9 +1972,11 @@ fn test_channel_reserve_holding_cell_htlcs() {
                _ => panic!("Unexpected event"),
        }
        match events[1] {
-               Event::PaymentReceived { ref payment_hash, ref purpose, amount_msat } => {
+               Event::PaymentClaimable { ref payment_hash, ref purpose, amount_msat, receiver_node_id, via_channel_id, via_user_channel_id: _ } => {
                        assert_eq!(our_payment_hash_22, *payment_hash);
                        assert_eq!(recv_value_22, amount_msat);
+                       assert_eq!(nodes[2].node.get_our_node_id(), receiver_node_id.unwrap());
+                       assert_eq!(via_channel_id, Some(chan_2.2));
                        match &purpose {
                                PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
                                        assert!(payment_preimage.is_none());
@@ -2040,7 +2045,7 @@ fn channel_reserve_in_flight_removes() {
        // Start routing the third HTLC (this is just used to get everyone in the right state).
        let (route, payment_hash_3, payment_preimage_3, payment_secret_3) = get_route_and_payment_hash!(nodes[0], nodes[1], 100000);
        let send_1 = {
-               nodes[0].node.send_payment(&route, payment_hash_3, &Some(payment_secret_3)).unwrap();
+               nodes[0].node.send_payment(&route, payment_hash_3, &Some(payment_secret_3), PaymentId(payment_hash_3.0)).unwrap();
                check_added_monitors!(nodes[0], 1);
                let mut events = nodes[0].node.get_and_clear_pending_msg_events();
                assert_eq!(events.len(), 1);
@@ -2101,7 +2106,7 @@ fn channel_reserve_in_flight_removes() {
        assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
 
        expect_pending_htlcs_forwardable!(nodes[1]);
-       expect_payment_received!(nodes[1], payment_hash_3, payment_secret_3, 100000);
+       expect_payment_claimable!(nodes[1], payment_hash_3, payment_secret_3, 100000);
 
        // Note that as this RAA was generated before the delivery of the update_fulfill it shouldn't
        // resolve the second HTLC from A's point of view.
@@ -2114,7 +2119,7 @@ fn channel_reserve_in_flight_removes() {
        // to A to ensure that A doesn't count the almost-removed HTLC in update_add processing.
        let (route, payment_hash_4, payment_preimage_4, payment_secret_4) = get_route_and_payment_hash!(nodes[1], nodes[0], 10000);
        let send_2 = {
-               nodes[1].node.send_payment(&route, payment_hash_4, &Some(payment_secret_4)).unwrap();
+               nodes[1].node.send_payment(&route, payment_hash_4, &Some(payment_secret_4), PaymentId(payment_hash_4.0)).unwrap();
                check_added_monitors!(nodes[1], 1);
                let mut events = nodes[1].node.get_and_clear_pending_msg_events();
                assert_eq!(events.len(), 1);
@@ -2148,7 +2153,7 @@ fn channel_reserve_in_flight_removes() {
        check_added_monitors!(nodes[0], 1);
 
        expect_pending_htlcs_forwardable!(nodes[0]);
-       expect_payment_received!(nodes[0], payment_hash_4, payment_secret_4, 10000);
+       expect_payment_claimable!(nodes[0], payment_hash_4, payment_secret_4, 10000);
 
        claim_payment(&nodes[1], &[&nodes[0]], payment_preimage_4);
        claim_payment(&nodes[0], &[&nodes[1]], payment_preimage_3);
@@ -2335,7 +2340,8 @@ fn channel_monitor_network_test() {
        assert_eq!(nodes[3].node.list_channels().len(), 0);
        assert_eq!(nodes[4].node.list_channels().len(), 0);
 
-       nodes[3].chain_monitor.chain_monitor.watch_channel(OutPoint { txid: chan_3.3.txid(), index: 0 }, chan_3_mon).unwrap();
+       assert_eq!(nodes[3].chain_monitor.chain_monitor.watch_channel(OutPoint { txid: chan_3.3.txid(), index: 0 }, chan_3_mon),
+               ChannelMonitorUpdateStatus::Completed);
        check_closed_event!(nodes[3], 1, ClosureReason::CommitmentTxConfirmed);
        check_closed_event!(nodes[4], 1, ClosureReason::CommitmentTxConfirmed);
 }
@@ -2812,12 +2818,17 @@ fn test_htlc_on_chain_success() {
        check_added_monitors!(nodes[1], 1);
        check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
        let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().clone();
-       assert_eq!(node_txn.len(), 6); // ChannelManager : 3 (commitment tx + HTLC-Sucess * 2), ChannelMonitor : 3 (HTLC-Success, 2* RBF bumps of above HTLC txn)
+       assert!(node_txn.len() == 4 || node_txn.len() == 6); // ChannelManager : 3 (commitment tx + HTLC-Sucess * 2), ChannelMonitor : 3 (HTLC-Success, 2* RBF bumps of above HTLC txn)
        let commitment_spend =
                if node_txn[0].input[0].previous_output.txid == node_a_commitment_tx[0].txid() {
-                       check_spends!(node_txn[1], commitment_tx[0]);
-                       check_spends!(node_txn[2], commitment_tx[0]);
-                       assert_ne!(node_txn[1].input[0].previous_output.vout, node_txn[2].input[0].previous_output.vout);
+                       if node_txn.len() == 6 {
+                               // In some block `ConnectionStyle`s we may avoid broadcasting the double-spending
+                               // transactions spending the HTLC outputs of C's commitment transaction. Otherwise,
+                               // check that the extra broadcasts (double-)spend those here.
+                               check_spends!(node_txn[1], commitment_tx[0]);
+                               check_spends!(node_txn[2], commitment_tx[0]);
+                               assert_ne!(node_txn[1].input[0].previous_output.vout, node_txn[2].input[0].previous_output.vout);
+                       }
                        &node_txn[0]
                } else {
                        check_spends!(node_txn[0], commitment_tx[0]);
@@ -2832,10 +2843,11 @@ fn test_htlc_on_chain_success() {
        assert_eq!(commitment_spend.input[1].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
        assert_eq!(commitment_spend.lock_time.0, 0);
        assert!(commitment_spend.output[0].script_pubkey.is_v0_p2wpkh()); // direct payment
-       check_spends!(node_txn[3], chan_1.3);
-       assert_eq!(node_txn[3].input[0].witness.clone().last().unwrap().len(), 71);
-       check_spends!(node_txn[4], node_txn[3]);
-       check_spends!(node_txn[5], node_txn[3]);
+       let funding_spend_offset = if node_txn.len() == 6 { 3 } else { 1 };
+       check_spends!(node_txn[funding_spend_offset], chan_1.3);
+       assert_eq!(node_txn[funding_spend_offset].input[0].witness.clone().last().unwrap().len(), 71);
+       check_spends!(node_txn[funding_spend_offset + 1], node_txn[funding_spend_offset]);
+       check_spends!(node_txn[funding_spend_offset + 2], node_txn[funding_spend_offset]);
        // We don't bother to check that B can claim the HTLC output on its commitment tx here as
        // we already checked the same situation with A.
 
@@ -2950,26 +2962,8 @@ fn do_test_htlc_on_chain_timeout(connect_style: ConnectStyle) {
        mine_transaction(&nodes[1], &timeout_tx);
        check_added_monitors!(nodes[1], 1);
        check_closed_broadcast!(nodes[1], true);
-       {
-               // B will rebroadcast a fee-bumped timeout transaction here.
-               let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0);
-               assert_eq!(node_txn.len(), 1);
-               check_spends!(node_txn[0], commitment_tx[0]);
-       }
 
        connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
-       {
-               // B may rebroadcast its own holder commitment transaction here, as a safeguard against
-               // some incredibly unlikely partial-eclipse-attack scenarios. That said, because the
-               // original commitment_tx[0] (also spending chan_2.3) has reached ANTI_REORG_DELAY B really
-               // shouldn't broadcast anything here, and in some connect style scenarios we do not.
-               let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0);
-               if node_txn.len() == 1 {
-                       check_spends!(node_txn[0], chan_2.3);
-               } else {
-                       assert_eq!(node_txn.len(), 0);
-               }
-       }
 
        expect_pending_htlcs_forwardable_and_htlc_handling_failed!(nodes[1], vec![HTLCDestination::NextHopChannel { node_id: Some(nodes[2].node.get_our_node_id()), channel_id: chan_2.2 }]);
        check_added_monitors!(nodes[1], 1);
@@ -3153,7 +3147,7 @@ fn do_test_commitment_revoked_fail_backward_exhaustive(deliver_bs_raa: bool, use
        // Add a fourth HTLC, this one will get sequestered away in nodes[1]'s holding cell waiting
        // on nodes[2]'s RAA.
        let (route, fourth_payment_hash, _, fourth_payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[2], 1000000);
-       nodes[1].node.send_payment(&route, fourth_payment_hash, &Some(fourth_payment_secret)).unwrap();
+       nodes[1].node.send_payment(&route, fourth_payment_hash, &Some(fourth_payment_secret), PaymentId(fourth_payment_hash.0)).unwrap();
        assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
        assert!(nodes[1].node.get_and_clear_pending_events().is_empty());
        check_added_monitors!(nodes[1], 0);
@@ -3183,10 +3177,9 @@ fn do_test_commitment_revoked_fail_backward_exhaustive(deliver_bs_raa: bool, use
        mine_transaction(&nodes[1], &revoked_local_txn[0]);
        check_added_monitors!(nodes[1], 1);
        connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
-       assert!(ANTI_REORG_DELAY > PAYMENT_EXPIRY_BLOCKS); // We assume payments will also expire
 
        let events = nodes[1].node.get_and_clear_pending_events();
-       assert_eq!(events.len(), if deliver_bs_raa { 2 + (nodes.len() - 1) } else { 4 + nodes.len() });
+       assert_eq!(events.len(), if deliver_bs_raa { 2 + nodes.len() - 1 } else { 3 + nodes.len() });
        match events[0] {
                Event::ChannelClosed { reason: ClosureReason::CommitmentTxConfirmed, .. } => { },
                _ => panic!("Unexepected event"),
@@ -3199,15 +3192,18 @@ fn do_test_commitment_revoked_fail_backward_exhaustive(deliver_bs_raa: bool, use
        }
        if !deliver_bs_raa {
                match events[2] {
+                       Event::PendingHTLCsForwardable { .. } => { },
+                       _ => panic!("Unexpected event"),
+               };
+               nodes[1].node.abandon_payment(PaymentId(fourth_payment_hash.0));
+               let payment_failed_events = nodes[1].node.get_and_clear_pending_events();
+               assert_eq!(payment_failed_events.len(), 1);
+               match payment_failed_events[0] {
                        Event::PaymentFailed { ref payment_hash, .. } => {
                                assert_eq!(*payment_hash, fourth_payment_hash);
                        },
                        _ => panic!("Unexpected event"),
                }
-               match events[3] {
-                       Event::PendingHTLCsForwardable { .. } => { },
-                       _ => panic!("Unexpected event"),
-               };
        }
        nodes[1].node.process_pending_htlc_forwards();
        check_added_monitors!(nodes[1], 1);
@@ -3314,7 +3310,7 @@ fn fail_backward_pending_htlc_upon_channel_failure() {
        // Alice -> Bob: Route a payment but without Bob sending revoke_and_ack.
        {
                let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 50_000);
-               nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
+               nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret), PaymentId(payment_hash.0)).unwrap();
                check_added_monitors!(nodes[0], 1);
 
                let payment_event = {
@@ -3329,7 +3325,7 @@ fn fail_backward_pending_htlc_upon_channel_failure() {
        // Alice -> Bob: Route another payment but now Alice waits for Bob's earlier revoke_and_ack.
        let (route, failed_payment_hash, _, failed_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 50_000);
        {
-               nodes[0].node.send_payment(&route, failed_payment_hash, &Some(failed_payment_secret)).unwrap();
+               nodes[0].node.send_payment(&route, failed_payment_hash, &Some(failed_payment_secret), PaymentId(failed_payment_hash.0)).unwrap();
                check_added_monitors!(nodes[0], 0);
 
                assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
@@ -3384,6 +3380,12 @@ fn test_htlc_ignore_latest_remote_commitment() {
        let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
        let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
        let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
+       if *nodes[1].connect_style.borrow() == ConnectStyle::FullBlockViaListen {
+               // We rely on the ability to connect a block redundantly, which isn't allowed via
+               // `chain::Listen`, so we never run the test if we randomly get assigned that
+               // connect_style.
+               return;
+       }
        create_announced_chan_between_nodes(&nodes, 0, 1, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 
        route_payment(&nodes[0], &[&nodes[1]], 10000000);
@@ -3405,7 +3407,6 @@ fn test_htlc_ignore_latest_remote_commitment() {
 
        // Duplicate the connect_block call since this may happen due to other listeners
        // registering new transactions
-       header.prev_blockhash = header.block_hash();
        connect_block(&nodes[1], &Block { header, txdata: vec![node_txn[0].clone(), node_txn[2].clone()]});
 }
 
@@ -3422,7 +3423,7 @@ fn test_force_close_fail_back() {
        let (route, our_payment_hash, our_payment_preimage, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[2], 1000000);
 
        let mut payment_event = {
-               nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+               nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
                check_added_monitors!(nodes[0], 1);
 
                let mut events = nodes[0].node.get_and_clear_pending_msg_events();
@@ -3626,20 +3627,21 @@ fn do_test_drop_messages_peer_disconnect(messages_delivered: u8, simulate_broken
        let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 
        let mut as_channel_ready = None;
-       if messages_delivered == 0 {
-               let (channel_ready, _, _) = create_chan_between_nodes_with_value_a(&nodes[0], &nodes[1], 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+       let channel_id = if messages_delivered == 0 {
+               let (channel_ready, chan_id, _) = create_chan_between_nodes_with_value_a(&nodes[0], &nodes[1], 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
                as_channel_ready = Some(channel_ready);
                // nodes[1] doesn't receive the channel_ready message (it'll be re-sent on reconnect)
                // Note that we store it so that if we're running with `simulate_broken_lnd` we can deliver
                // it before the channel_reestablish message.
+               chan_id
        } else {
-               create_announced_chan_between_nodes(&nodes, 0, 1, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-       }
+               create_announced_chan_between_nodes(&nodes, 0, 1, channelmanager::provided_init_features(), channelmanager::provided_init_features()).2
+       };
 
        let (route, payment_hash_1, payment_preimage_1, payment_secret_1) = get_route_and_payment_hash!(nodes[0], nodes[1], 1_000_000);
 
        let payment_event = {
-               nodes[0].node.send_payment(&route, payment_hash_1, &Some(payment_secret_1)).unwrap();
+               nodes[0].node.send_payment(&route, payment_hash_1, &Some(payment_secret_1), PaymentId(payment_hash_1.0)).unwrap();
                check_added_monitors!(nodes[0], 1);
 
                let mut events = nodes[0].node.get_and_clear_pending_msg_events();
@@ -3710,11 +3712,23 @@ fn do_test_drop_messages_peer_disconnect(messages_delivered: u8, simulate_broken
        }
 
        let events_1 = nodes[1].node.get_and_clear_pending_events();
-       assert_eq!(events_1.len(), 1);
-       match events_1[0] {
-               Event::PendingHTLCsForwardable { .. } => { },
-               _ => panic!("Unexpected event"),
-       };
+       if messages_delivered == 0 {
+               assert_eq!(events_1.len(), 2);
+               match events_1[0] {
+                       Event::ChannelReady { .. } => { },
+                       _ => panic!("Unexpected event"),
+               };
+               match events_1[1] {
+                       Event::PendingHTLCsForwardable { .. } => { },
+                       _ => panic!("Unexpected event"),
+               };
+       } else {
+               assert_eq!(events_1.len(), 1);
+               match events_1[0] {
+                       Event::PendingHTLCsForwardable { .. } => { },
+                       _ => panic!("Unexpected event"),
+               };
+       }
 
        nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
        nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
@@ -3725,9 +3739,11 @@ fn do_test_drop_messages_peer_disconnect(messages_delivered: u8, simulate_broken
        let events_2 = nodes[1].node.get_and_clear_pending_events();
        assert_eq!(events_2.len(), 1);
        match events_2[0] {
-               Event::PaymentReceived { ref payment_hash, ref purpose, amount_msat } => {
+               Event::PaymentClaimable { ref payment_hash, ref purpose, amount_msat, receiver_node_id, via_channel_id, via_user_channel_id: _ } => {
                        assert_eq!(payment_hash_1, *payment_hash);
                        assert_eq!(amount_msat, 1_000_000);
+                       assert_eq!(receiver_node_id.unwrap(), nodes[1].node.get_our_node_id());
+                       assert_eq!(via_channel_id, Some(channel_id));
                        match &purpose {
                                PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
                                        assert!(payment_preimage.is_none());
@@ -3854,180 +3870,6 @@ fn test_drop_messages_peer_disconnect_b() {
        do_test_drop_messages_peer_disconnect(6, false);
 }
 
-#[test]
-fn test_funding_peer_disconnect() {
-       // Test that we can lock in our funding tx while disconnected
-       let chanmon_cfgs = create_chanmon_cfgs(2);
-       let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
-       let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
-       let persister: test_utils::TestPersister;
-       let new_chain_monitor: test_utils::TestChainMonitor;
-       let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
-       let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
-       let tx = create_chan_between_nodes_with_value_init(&nodes[0], &nodes[1], 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-
-       nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
-       nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
-
-       confirm_transaction(&nodes[0], &tx);
-       let events_1 = nodes[0].node.get_and_clear_pending_msg_events();
-       assert!(events_1.is_empty());
-
-       reconnect_nodes(&nodes[0], &nodes[1], (false, true), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
-
-       nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
-       nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
-
-       confirm_transaction(&nodes[1], &tx);
-       let events_2 = nodes[1].node.get_and_clear_pending_msg_events();
-       assert!(events_2.is_empty());
-
-       nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-       let as_reestablish = get_chan_reestablish_msgs!(nodes[0], nodes[1]).pop().unwrap();
-       nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-       let bs_reestablish = get_chan_reestablish_msgs!(nodes[1], nodes[0]).pop().unwrap();
-
-       // nodes[0] hasn't yet received a channel_ready, so it only sends that on reconnect.
-       nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &bs_reestablish);
-       let events_3 = nodes[0].node.get_and_clear_pending_msg_events();
-       assert_eq!(events_3.len(), 1);
-       let as_channel_ready = match events_3[0] {
-               MessageSendEvent::SendChannelReady { ref node_id, ref msg } => {
-                       assert_eq!(*node_id, nodes[1].node.get_our_node_id());
-                       msg.clone()
-               },
-               _ => panic!("Unexpected event {:?}", events_3[0]),
-       };
-
-       // nodes[1] received nodes[0]'s channel_ready on the first reconnect above, so it should send
-       // announcement_signatures as well as channel_update.
-       nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &as_reestablish);
-       let events_4 = nodes[1].node.get_and_clear_pending_msg_events();
-       assert_eq!(events_4.len(), 3);
-       let chan_id;
-       let bs_channel_ready = match events_4[0] {
-               MessageSendEvent::SendChannelReady { ref node_id, ref msg } => {
-                       assert_eq!(*node_id, nodes[0].node.get_our_node_id());
-                       chan_id = msg.channel_id;
-                       msg.clone()
-               },
-               _ => panic!("Unexpected event {:?}", events_4[0]),
-       };
-       let bs_announcement_sigs = match events_4[1] {
-               MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
-                       assert_eq!(*node_id, nodes[0].node.get_our_node_id());
-                       msg.clone()
-               },
-               _ => panic!("Unexpected event {:?}", events_4[1]),
-       };
-       match events_4[2] {
-               MessageSendEvent::SendChannelUpdate { ref node_id, msg: _ } => {
-                       assert_eq!(*node_id, nodes[0].node.get_our_node_id());
-               },
-               _ => panic!("Unexpected event {:?}", events_4[2]),
-       }
-
-       // Re-deliver nodes[0]'s channel_ready, which nodes[1] can safely ignore. It currently
-       // generates a duplicative private channel_update
-       nodes[1].node.handle_channel_ready(&nodes[0].node.get_our_node_id(), &as_channel_ready);
-       let events_5 = nodes[1].node.get_and_clear_pending_msg_events();
-       assert_eq!(events_5.len(), 1);
-       match events_5[0] {
-               MessageSendEvent::SendChannelUpdate { ref node_id, msg: _ } => {
-                       assert_eq!(*node_id, nodes[0].node.get_our_node_id());
-               },
-               _ => panic!("Unexpected event {:?}", events_5[0]),
-       };
-
-       // When we deliver nodes[1]'s channel_ready, however, nodes[0] will generate its
-       // announcement_signatures.
-       nodes[0].node.handle_channel_ready(&nodes[1].node.get_our_node_id(), &bs_channel_ready);
-       let events_6 = nodes[0].node.get_and_clear_pending_msg_events();
-       assert_eq!(events_6.len(), 1);
-       let as_announcement_sigs = match events_6[0] {
-               MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
-                       assert_eq!(*node_id, nodes[1].node.get_our_node_id());
-                       msg.clone()
-               },
-               _ => panic!("Unexpected event {:?}", events_6[0]),
-       };
-
-       // When we deliver nodes[1]'s announcement_signatures to nodes[0], nodes[0] should immediately
-       // broadcast the channel announcement globally, as well as re-send its (now-public)
-       // channel_update.
-       nodes[0].node.handle_announcement_signatures(&nodes[1].node.get_our_node_id(), &bs_announcement_sigs);
-       let events_7 = nodes[0].node.get_and_clear_pending_msg_events();
-       assert_eq!(events_7.len(), 1);
-       let (chan_announcement, as_update) = match events_7[0] {
-               MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
-                       (msg.clone(), update_msg.clone())
-               },
-               _ => panic!("Unexpected event {:?}", events_7[0]),
-       };
-
-       // Finally, deliver nodes[0]'s announcement_signatures to nodes[1] and make sure it creates the
-       // same channel_announcement.
-       nodes[1].node.handle_announcement_signatures(&nodes[0].node.get_our_node_id(), &as_announcement_sigs);
-       let events_8 = nodes[1].node.get_and_clear_pending_msg_events();
-       assert_eq!(events_8.len(), 1);
-       let bs_update = match events_8[0] {
-               MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
-                       assert_eq!(*msg, chan_announcement);
-                       update_msg.clone()
-               },
-               _ => panic!("Unexpected event {:?}", events_8[0]),
-       };
-
-       // Provide the channel announcement and public updates to the network graph
-       nodes[0].gossip_sync.handle_channel_announcement(&chan_announcement).unwrap();
-       nodes[0].gossip_sync.handle_channel_update(&bs_update).unwrap();
-       nodes[0].gossip_sync.handle_channel_update(&as_update).unwrap();
-
-       let (route, _, _, _) = get_route_and_payment_hash!(nodes[0], nodes[1], 1000000);
-       let payment_preimage = send_along_route(&nodes[0], route, &[&nodes[1]], 1000000).0;
-       claim_payment(&nodes[0], &[&nodes[1]], payment_preimage);
-
-       // Check that after deserialization and reconnection we can still generate an identical
-       // channel_announcement from the cached signatures.
-       nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
-
-       let nodes_0_serialized = nodes[0].node.encode();
-       let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
-       get_monitor!(nodes[0], chan_id).write(&mut chan_0_monitor_serialized).unwrap();
-
-       persister = test_utils::TestPersister::new();
-       let keys_manager = &chanmon_cfgs[0].keys_manager;
-       new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), nodes[0].logger, node_cfgs[0].fee_estimator, &persister, keys_manager);
-       nodes[0].chain_monitor = &new_chain_monitor;
-       let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
-       let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(
-               &mut chan_0_monitor_read, keys_manager).unwrap();
-       assert!(chan_0_monitor_read.is_empty());
-
-       let mut nodes_0_read = &nodes_0_serialized[..];
-       let (_, nodes_0_deserialized_tmp) = {
-               let mut channel_monitors = HashMap::new();
-               channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
-               <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
-                       default_config: UserConfig::default(),
-                       keys_manager,
-                       fee_estimator: node_cfgs[0].fee_estimator,
-                       chain_monitor: nodes[0].chain_monitor,
-                       tx_broadcaster: nodes[0].tx_broadcaster.clone(),
-                       logger: nodes[0].logger,
-                       channel_monitors,
-               }).unwrap()
-       };
-       nodes_0_deserialized = nodes_0_deserialized_tmp;
-       assert!(nodes_0_read.is_empty());
-
-       assert!(nodes[0].chain_monitor.watch_channel(chan_0_monitor.get_funding_txo().0, chan_0_monitor).is_ok());
-       nodes[0].node = &nodes_0_deserialized;
-       check_added_monitors!(nodes[0], 1);
-
-       reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
-}
-
 #[test]
 fn test_channel_ready_without_best_block_updated() {
        // Previously, if we were offline when a funding transaction was locked in, and then we came
@@ -4068,7 +3910,7 @@ fn test_drop_messages_peer_disconnect_dual_htlc() {
 
        // Now try to send a second payment which will fail to send
        let (route, payment_hash_2, payment_preimage_2, payment_secret_2) = get_route_and_payment_hash!(nodes[0], nodes[1], 1000000);
-       nodes[0].node.send_payment(&route, payment_hash_2, &Some(payment_secret_2)).unwrap();
+       nodes[0].node.send_payment(&route, payment_hash_2, &Some(payment_secret_2), PaymentId(payment_hash_2.0)).unwrap();
        check_added_monitors!(nodes[0], 1);
 
        let events_1 = nodes[0].node.get_and_clear_pending_msg_events();
@@ -4183,7 +4025,7 @@ fn test_drop_messages_peer_disconnect_dual_htlc() {
        let events_5 = nodes[1].node.get_and_clear_pending_events();
        assert_eq!(events_5.len(), 1);
        match events_5[0] {
-               Event::PaymentReceived { ref payment_hash, ref purpose, .. } => {
+               Event::PaymentClaimable { ref payment_hash, ref purpose, .. } => {
                        assert_eq!(payment_hash_2, *payment_hash);
                        match &purpose {
                                PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
@@ -4220,12 +4062,13 @@ fn do_test_htlc_timeout(send_partial_mpp: bool) {
                // indicates there are more HTLCs coming.
                let cur_height = CHAN_CONFIRM_DEPTH + 1; // route_payment calls send_payment, which adds 1 to the current height. So we do the same here to match.
                let payment_id = PaymentId([42; 32]);
-               nodes[0].node.send_payment_along_path(&route.paths[0], &route.payment_params, &our_payment_hash, &Some(payment_secret), 200000, cur_height, payment_id, &None).unwrap();
+               let session_privs = nodes[0].node.test_add_new_pending_payment(our_payment_hash, Some(payment_secret), payment_id, &route).unwrap();
+               nodes[0].node.send_payment_along_path(&route.paths[0], &route.payment_params, &our_payment_hash, &Some(payment_secret), 200_000, cur_height, payment_id, &None, session_privs[0]).unwrap();
                check_added_monitors!(nodes[0], 1);
                let mut events = nodes[0].node.get_and_clear_pending_msg_events();
                assert_eq!(events.len(), 1);
                // Now do the relevant commitment_signed/RAA dances along the path, noting that the final
-               // hop should *not* yet generate any PaymentReceived event(s).
+               // hop should *not* yet generate any PaymentClaimable event(s).
                pass_along_path(&nodes[0], &[&nodes[1]], 100000, our_payment_hash, Some(payment_secret), events.drain(..).next().unwrap(), false, None);
                our_payment_hash
        } else {
@@ -4257,8 +4100,8 @@ fn do_test_htlc_timeout(send_partial_mpp: bool) {
        nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &htlc_timeout_updates.update_fail_htlcs[0]);
        commitment_signed_dance!(nodes[0], nodes[1], htlc_timeout_updates.commitment_signed, false);
        // 100_000 msat as u64, followed by the height at which we failed back above
-       let mut expected_failure_data = byte_utils::be64_to_array(100_000).to_vec();
-       expected_failure_data.extend_from_slice(&byte_utils::be32_to_array(block_count - 1));
+       let mut expected_failure_data = (100_000 as u64).to_be_bytes().to_vec();
+       expected_failure_data.extend_from_slice(&(block_count - 1).to_be_bytes());
        expect_payment_failed!(nodes[0], our_payment_hash, true, 0x4000 | 15, &expected_failure_data[..]);
 }
 
@@ -4285,7 +4128,7 @@ fn do_test_holding_cell_htlc_add_timeouts(forwarded_htlc: bool) {
        // Route a first payment to get the 1 -> 2 channel in awaiting_raa...
        let (route, first_payment_hash, _, first_payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[2], 100000);
        {
-               nodes[1].node.send_payment(&route, first_payment_hash, &Some(first_payment_secret)).unwrap();
+               nodes[1].node.send_payment(&route, first_payment_hash, &Some(first_payment_secret), PaymentId(first_payment_hash.0)).unwrap();
        }
        assert_eq!(nodes[1].node.get_and_clear_pending_msg_events().len(), 1);
        check_added_monitors!(nodes[1], 1);
@@ -4293,7 +4136,7 @@ fn do_test_holding_cell_htlc_add_timeouts(forwarded_htlc: bool) {
        // Now attempt to route a second payment, which should be placed in the holding cell
        let sending_node = if forwarded_htlc { &nodes[0] } else { &nodes[1] };
        let (route, second_payment_hash, _, second_payment_secret) = get_route_and_payment_hash!(sending_node, nodes[2], 100000);
-       sending_node.node.send_payment(&route, second_payment_hash, &Some(second_payment_secret)).unwrap();
+       sending_node.node.send_payment(&route, second_payment_hash, &Some(second_payment_secret), PaymentId(second_payment_hash.0)).unwrap();
        if forwarded_htlc {
                check_added_monitors!(nodes[0], 1);
                let payment_event = SendEvent::from_event(nodes[0].node.get_and_clear_pending_msg_events().remove(0));
@@ -4322,14 +4165,7 @@ fn do_test_holding_cell_htlc_add_timeouts(forwarded_htlc: bool) {
                }
                expect_payment_failed_with_update!(nodes[0], second_payment_hash, false, chan_2.0.contents.short_channel_id, false);
        } else {
-               let events = nodes[1].node.get_and_clear_pending_events();
-               assert_eq!(events.len(), 2);
-               if let Event::PaymentPathFailed { ref payment_hash, .. } = events[0] {
-                       assert_eq!(*payment_hash, second_payment_hash);
-               } else { panic!("Unexpected event"); }
-               if let Event::PaymentFailed { ref payment_hash, .. } = events[1] {
-                       assert_eq!(*payment_hash, second_payment_hash);
-               } else { panic!("Unexpected event"); }
+               expect_payment_failed!(nodes[1], second_payment_hash, false);
        }
 }
 
@@ -4339,396 +4175,6 @@ fn test_holding_cell_htlc_add_timeouts() {
        do_test_holding_cell_htlc_add_timeouts(true);
 }
 
-#[test]
-fn test_no_txn_manager_serialize_deserialize() {
-       let chanmon_cfgs = create_chanmon_cfgs(2);
-       let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
-       let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
-       let logger: test_utils::TestLogger;
-       let fee_estimator: test_utils::TestFeeEstimator;
-       let persister: test_utils::TestPersister;
-       let new_chain_monitor: test_utils::TestChainMonitor;
-       let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
-       let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
-
-       let tx = create_chan_between_nodes_with_value_init(&nodes[0], &nodes[1], 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-
-       nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
-
-       let nodes_0_serialized = nodes[0].node.encode();
-       let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
-       get_monitor!(nodes[0], OutPoint { txid: tx.txid(), index: 0 }.to_channel_id())
-               .write(&mut chan_0_monitor_serialized).unwrap();
-
-       logger = test_utils::TestLogger::new();
-       fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) };
-       persister = test_utils::TestPersister::new();
-       let keys_manager = &chanmon_cfgs[0].keys_manager;
-       new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister, keys_manager);
-       nodes[0].chain_monitor = &new_chain_monitor;
-       let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
-       let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(
-               &mut chan_0_monitor_read, keys_manager).unwrap();
-       assert!(chan_0_monitor_read.is_empty());
-
-       let mut nodes_0_read = &nodes_0_serialized[..];
-       let config = UserConfig::default();
-       let (_, nodes_0_deserialized_tmp) = {
-               let mut channel_monitors = HashMap::new();
-               channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
-               <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
-                       default_config: config,
-                       keys_manager,
-                       fee_estimator: &fee_estimator,
-                       chain_monitor: nodes[0].chain_monitor,
-                       tx_broadcaster: nodes[0].tx_broadcaster.clone(),
-                       logger: &logger,
-                       channel_monitors,
-               }).unwrap()
-       };
-       nodes_0_deserialized = nodes_0_deserialized_tmp;
-       assert!(nodes_0_read.is_empty());
-
-       assert!(nodes[0].chain_monitor.watch_channel(chan_0_monitor.get_funding_txo().0, chan_0_monitor).is_ok());
-       nodes[0].node = &nodes_0_deserialized;
-       assert_eq!(nodes[0].node.list_channels().len(), 1);
-       check_added_monitors!(nodes[0], 1);
-
-       nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-       let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
-       nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-       let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
-
-       nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]);
-       assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
-       nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_2[0]);
-       assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
-
-       let (channel_ready, _) = create_chan_between_nodes_with_value_confirm(&nodes[0], &nodes[1], &tx);
-       let (announcement, as_update, bs_update) = create_chan_between_nodes_with_value_b(&nodes[0], &nodes[1], &channel_ready);
-       for node in nodes.iter() {
-               assert!(node.gossip_sync.handle_channel_announcement(&announcement).unwrap());
-               node.gossip_sync.handle_channel_update(&as_update).unwrap();
-               node.gossip_sync.handle_channel_update(&bs_update).unwrap();
-       }
-
-       send_payment(&nodes[0], &[&nodes[1]], 1000000);
-}
-
-#[test]
-fn test_manager_serialize_deserialize_events() {
-       // This test makes sure the events field in ChannelManager survives de/serialization
-       let chanmon_cfgs = create_chanmon_cfgs(2);
-       let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
-       let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
-       let fee_estimator: test_utils::TestFeeEstimator;
-       let persister: test_utils::TestPersister;
-       let logger: test_utils::TestLogger;
-       let new_chain_monitor: test_utils::TestChainMonitor;
-       let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
-       let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
-
-       // Start creating a channel, but stop right before broadcasting the funding transaction
-       let channel_value = 100000;
-       let push_msat = 10001;
-       let a_flags = channelmanager::provided_init_features();
-       let b_flags = channelmanager::provided_init_features();
-       let node_a = nodes.remove(0);
-       let node_b = nodes.remove(0);
-       node_a.node.create_channel(node_b.node.get_our_node_id(), channel_value, push_msat, 42, None).unwrap();
-       node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), a_flags, &get_event_msg!(node_a, MessageSendEvent::SendOpenChannel, node_b.node.get_our_node_id()));
-       node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), b_flags, &get_event_msg!(node_b, MessageSendEvent::SendAcceptChannel, node_a.node.get_our_node_id()));
-
-       let (temporary_channel_id, tx, funding_output) = create_funding_transaction(&node_a, &node_b.node.get_our_node_id(), channel_value, 42);
-
-       node_a.node.funding_transaction_generated(&temporary_channel_id, &node_b.node.get_our_node_id(), tx.clone()).unwrap();
-       check_added_monitors!(node_a, 0);
-
-       node_b.node.handle_funding_created(&node_a.node.get_our_node_id(), &get_event_msg!(node_a, MessageSendEvent::SendFundingCreated, node_b.node.get_our_node_id()));
-       {
-               let mut added_monitors = node_b.chain_monitor.added_monitors.lock().unwrap();
-               assert_eq!(added_monitors.len(), 1);
-               assert_eq!(added_monitors[0].0, funding_output);
-               added_monitors.clear();
-       }
-
-       let bs_funding_signed = get_event_msg!(node_b, MessageSendEvent::SendFundingSigned, node_a.node.get_our_node_id());
-       node_a.node.handle_funding_signed(&node_b.node.get_our_node_id(), &bs_funding_signed);
-       {
-               let mut added_monitors = node_a.chain_monitor.added_monitors.lock().unwrap();
-               assert_eq!(added_monitors.len(), 1);
-               assert_eq!(added_monitors[0].0, funding_output);
-               added_monitors.clear();
-       }
-       // Normally, this is where node_a would broadcast the funding transaction, but the test de/serializes first instead
-
-       nodes.push(node_a);
-       nodes.push(node_b);
-
-       // Start the de/seriailization process mid-channel creation to check that the channel manager will hold onto events that are serialized
-       let nodes_0_serialized = nodes[0].node.encode();
-       let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
-       get_monitor!(nodes[0], bs_funding_signed.channel_id).write(&mut chan_0_monitor_serialized).unwrap();
-
-       fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) };
-       logger = test_utils::TestLogger::new();
-       persister = test_utils::TestPersister::new();
-       let keys_manager = &chanmon_cfgs[0].keys_manager;
-       new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister, keys_manager);
-       nodes[0].chain_monitor = &new_chain_monitor;
-       let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
-       let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(
-               &mut chan_0_monitor_read, keys_manager).unwrap();
-       assert!(chan_0_monitor_read.is_empty());
-
-       let mut nodes_0_read = &nodes_0_serialized[..];
-       let config = UserConfig::default();
-       let (_, nodes_0_deserialized_tmp) = {
-               let mut channel_monitors = HashMap::new();
-               channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
-               <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
-                       default_config: config,
-                       keys_manager,
-                       fee_estimator: &fee_estimator,
-                       chain_monitor: nodes[0].chain_monitor,
-                       tx_broadcaster: nodes[0].tx_broadcaster.clone(),
-                       logger: &logger,
-                       channel_monitors,
-               }).unwrap()
-       };
-       nodes_0_deserialized = nodes_0_deserialized_tmp;
-       assert!(nodes_0_read.is_empty());
-
-       nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
-
-       assert!(nodes[0].chain_monitor.watch_channel(chan_0_monitor.get_funding_txo().0, chan_0_monitor).is_ok());
-       nodes[0].node = &nodes_0_deserialized;
-
-       // After deserializing, make sure the funding_transaction is still held by the channel manager
-       let events_4 = nodes[0].node.get_and_clear_pending_events();
-       assert_eq!(events_4.len(), 0);
-       assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 1);
-       assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap()[0].txid(), funding_output.txid);
-
-       // Make sure the channel is functioning as though the de/serialization never happened
-       assert_eq!(nodes[0].node.list_channels().len(), 1);
-       check_added_monitors!(nodes[0], 1);
-
-       nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-       let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
-       nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-       let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
-
-       nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]);
-       assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
-       nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_2[0]);
-       assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
-
-       let (channel_ready, _) = create_chan_between_nodes_with_value_confirm(&nodes[0], &nodes[1], &tx);
-       let (announcement, as_update, bs_update) = create_chan_between_nodes_with_value_b(&nodes[0], &nodes[1], &channel_ready);
-       for node in nodes.iter() {
-               assert!(node.gossip_sync.handle_channel_announcement(&announcement).unwrap());
-               node.gossip_sync.handle_channel_update(&as_update).unwrap();
-               node.gossip_sync.handle_channel_update(&bs_update).unwrap();
-       }
-
-       send_payment(&nodes[0], &[&nodes[1]], 1000000);
-}
-
-#[test]
-fn test_simple_manager_serialize_deserialize() {
-       let chanmon_cfgs = create_chanmon_cfgs(2);
-       let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
-       let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
-       let logger: test_utils::TestLogger;
-       let fee_estimator: test_utils::TestFeeEstimator;
-       let persister: test_utils::TestPersister;
-       let new_chain_monitor: test_utils::TestChainMonitor;
-       let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
-       let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
-       let chan_id = create_announced_chan_between_nodes(&nodes, 0, 1, channelmanager::provided_init_features(), channelmanager::provided_init_features()).2;
-
-       let (our_payment_preimage, _, _) = route_payment(&nodes[0], &[&nodes[1]], 1000000);
-       let (_, our_payment_hash, _) = route_payment(&nodes[0], &[&nodes[1]], 1000000);
-
-       nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
-
-       let nodes_0_serialized = nodes[0].node.encode();
-       let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
-       get_monitor!(nodes[0], chan_id).write(&mut chan_0_monitor_serialized).unwrap();
-
-       logger = test_utils::TestLogger::new();
-       fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) };
-       persister = test_utils::TestPersister::new();
-       let keys_manager = &chanmon_cfgs[0].keys_manager;
-       new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister, keys_manager);
-       nodes[0].chain_monitor = &new_chain_monitor;
-       let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
-       let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(
-               &mut chan_0_monitor_read, keys_manager).unwrap();
-       assert!(chan_0_monitor_read.is_empty());
-
-       let mut nodes_0_read = &nodes_0_serialized[..];
-       let (_, nodes_0_deserialized_tmp) = {
-               let mut channel_monitors = HashMap::new();
-               channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
-               <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
-                       default_config: UserConfig::default(),
-                       keys_manager,
-                       fee_estimator: &fee_estimator,
-                       chain_monitor: nodes[0].chain_monitor,
-                       tx_broadcaster: nodes[0].tx_broadcaster.clone(),
-                       logger: &logger,
-                       channel_monitors,
-               }).unwrap()
-       };
-       nodes_0_deserialized = nodes_0_deserialized_tmp;
-       assert!(nodes_0_read.is_empty());
-
-       assert!(nodes[0].chain_monitor.watch_channel(chan_0_monitor.get_funding_txo().0, chan_0_monitor).is_ok());
-       nodes[0].node = &nodes_0_deserialized;
-       check_added_monitors!(nodes[0], 1);
-
-       reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
-
-       fail_payment(&nodes[0], &[&nodes[1]], our_payment_hash);
-       claim_payment(&nodes[0], &[&nodes[1]], our_payment_preimage);
-}
-
-#[test]
-fn test_manager_serialize_deserialize_inconsistent_monitor() {
-       // Test deserializing a ChannelManager with an out-of-date ChannelMonitor
-       let chanmon_cfgs = create_chanmon_cfgs(4);
-       let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
-       let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
-       let logger: test_utils::TestLogger;
-       let fee_estimator: test_utils::TestFeeEstimator;
-       let persister: test_utils::TestPersister;
-       let new_chain_monitor: test_utils::TestChainMonitor;
-       let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
-       let mut nodes = create_network(4, &node_cfgs, &node_chanmgrs);
-       let chan_id_1 = create_announced_chan_between_nodes(&nodes, 0, 1, channelmanager::provided_init_features(), channelmanager::provided_init_features()).2;
-       let chan_id_2 = create_announced_chan_between_nodes(&nodes, 2, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features()).2;
-       let (_, _, channel_id, funding_tx) = create_announced_chan_between_nodes(&nodes, 0, 3, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-
-       let mut node_0_stale_monitors_serialized = Vec::new();
-       for chan_id_iter in &[chan_id_1, chan_id_2, channel_id] {
-               let mut writer = test_utils::TestVecWriter(Vec::new());
-               get_monitor!(nodes[0], chan_id_iter).write(&mut writer).unwrap();
-               node_0_stale_monitors_serialized.push(writer.0);
-       }
-
-       let (our_payment_preimage, _, _) = route_payment(&nodes[2], &[&nodes[0], &nodes[1]], 1000000);
-
-       // Serialize the ChannelManager here, but the monitor we keep up-to-date
-       let nodes_0_serialized = nodes[0].node.encode();
-
-       route_payment(&nodes[0], &[&nodes[3]], 1000000);
-       nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
-       nodes[2].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
-       nodes[3].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
-
-       // Now the ChannelMonitor (which is now out-of-sync with ChannelManager for channel w/
-       // nodes[3])
-       let mut node_0_monitors_serialized = Vec::new();
-       for chan_id_iter in &[chan_id_1, chan_id_2, channel_id] {
-               let mut writer = test_utils::TestVecWriter(Vec::new());
-               get_monitor!(nodes[0], chan_id_iter).write(&mut writer).unwrap();
-               node_0_monitors_serialized.push(writer.0);
-       }
-
-       logger = test_utils::TestLogger::new();
-       fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) };
-       persister = test_utils::TestPersister::new();
-       let keys_manager = &chanmon_cfgs[0].keys_manager;
-       new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister, keys_manager);
-       nodes[0].chain_monitor = &new_chain_monitor;
-
-
-       let mut node_0_stale_monitors = Vec::new();
-       for serialized in node_0_stale_monitors_serialized.iter() {
-               let mut read = &serialized[..];
-               let (_, monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(&mut read, keys_manager).unwrap();
-               assert!(read.is_empty());
-               node_0_stale_monitors.push(monitor);
-       }
-
-       let mut node_0_monitors = Vec::new();
-       for serialized in node_0_monitors_serialized.iter() {
-               let mut read = &serialized[..];
-               let (_, monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(&mut read, keys_manager).unwrap();
-               assert!(read.is_empty());
-               node_0_monitors.push(monitor);
-       }
-
-       let mut nodes_0_read = &nodes_0_serialized[..];
-       if let Err(msgs::DecodeError::InvalidValue) =
-               <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
-               default_config: UserConfig::default(),
-               keys_manager,
-               fee_estimator: &fee_estimator,
-               chain_monitor: nodes[0].chain_monitor,
-               tx_broadcaster: nodes[0].tx_broadcaster.clone(),
-               logger: &logger,
-               channel_monitors: node_0_stale_monitors.iter_mut().map(|monitor| { (monitor.get_funding_txo().0, monitor) }).collect(),
-       }) { } else {
-               panic!("If the monitor(s) are stale, this indicates a bug and we should get an Err return");
-       };
-
-       let mut nodes_0_read = &nodes_0_serialized[..];
-       let (_, nodes_0_deserialized_tmp) =
-               <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
-               default_config: UserConfig::default(),
-               keys_manager,
-               fee_estimator: &fee_estimator,
-               chain_monitor: nodes[0].chain_monitor,
-               tx_broadcaster: nodes[0].tx_broadcaster.clone(),
-               logger: &logger,
-               channel_monitors: node_0_monitors.iter_mut().map(|monitor| { (monitor.get_funding_txo().0, monitor) }).collect(),
-       }).unwrap();
-       nodes_0_deserialized = nodes_0_deserialized_tmp;
-       assert!(nodes_0_read.is_empty());
-
-       { // Channel close should result in a commitment tx
-               let txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
-               assert_eq!(txn.len(), 1);
-               check_spends!(txn[0], funding_tx);
-               assert_eq!(txn[0].input[0].previous_output.txid, funding_tx.txid());
-       }
-
-       for monitor in node_0_monitors.drain(..) {
-               assert!(nodes[0].chain_monitor.watch_channel(monitor.get_funding_txo().0, monitor).is_ok());
-               check_added_monitors!(nodes[0], 1);
-       }
-       nodes[0].node = &nodes_0_deserialized;
-       check_closed_event!(nodes[0], 1, ClosureReason::OutdatedChannelManager);
-
-       // nodes[1] and nodes[2] have no lost state with nodes[0]...
-       reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
-       reconnect_nodes(&nodes[0], &nodes[2], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
-       //... and we can even still claim the payment!
-       claim_payment(&nodes[2], &[&nodes[0], &nodes[1]], our_payment_preimage);
-
-       nodes[3].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-       let reestablish = get_chan_reestablish_msgs!(nodes[3], nodes[0]).pop().unwrap();
-       nodes[0].node.peer_connected(&nodes[3].node.get_our_node_id(), &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-       nodes[0].node.handle_channel_reestablish(&nodes[3].node.get_our_node_id(), &reestablish);
-       let mut found_err = false;
-       for msg_event in nodes[0].node.get_and_clear_pending_msg_events() {
-               if let MessageSendEvent::HandleError { ref action, .. } = msg_event {
-                       match action {
-                               &ErrorAction::SendErrorMessage { ref msg } => {
-                                       assert_eq!(msg.channel_id, channel_id);
-                                       assert!(!found_err);
-                                       found_err = true;
-                               },
-                               _ => panic!("Unexpected event!"),
-                       }
-               }
-       }
-       assert!(found_err);
-}
-
 macro_rules! check_spendable_outputs {
        ($node: expr, $keysinterface: expr) => {
                {
@@ -5357,7 +4803,7 @@ fn test_duplicate_payment_hash_one_failure_one_success() {
        assert_eq!(htlc_success_txn[2], commitment_txn[0]);
        assert_eq!(htlc_success_txn[3], htlc_success_txn[0]);
        assert_eq!(htlc_success_txn[4], htlc_success_txn[1]);
-       assert_ne!(htlc_success_txn[0].input[0].previous_output, htlc_timeout_tx.input[0].previous_output);
+       assert_ne!(htlc_success_txn[1].input[0].previous_output, htlc_timeout_tx.input[0].previous_output);
 
        mine_transaction(&nodes[1], &htlc_timeout_tx);
        connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
@@ -5380,7 +4826,7 @@ fn test_duplicate_payment_hash_one_failure_one_success() {
        // Solve 2nd HTLC by broadcasting on B's chain HTLC-Success Tx from C
        // Note that the fee paid is effectively double as the HTLC value (including the nodes[1] fee
        // and nodes[2] fee) is rounded down and then claimed in full.
-       mine_transaction(&nodes[1], &htlc_success_txn[0]);
+       mine_transaction(&nodes[1], &htlc_success_txn[1]);
        expect_payment_forwarded!(nodes[1], nodes[0], nodes[2], Some(196*2), true, true);
        let updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
        assert!(updates.update_add_htlcs.is_empty());
@@ -5970,7 +5416,7 @@ fn do_htlc_claim_current_remote_commitment_only(use_dust: bool) {
        let chan = create_announced_chan_between_nodes(&nodes, 0, 1, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 
        let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], if use_dust { 50000 } else { 3000000 });
-       nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret), PaymentId(payment_hash.0)).unwrap();
        check_added_monitors!(nodes[0], 1);
 
        let _as_update = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
@@ -6040,14 +5486,7 @@ fn do_htlc_claim_previous_remote_commitment_only(use_dust: bool, check_revoke_no
                check_added_monitors!(nodes[0], 1);
                check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
        } else {
-               let events = nodes[0].node.get_and_clear_pending_events();
-               assert_eq!(events.len(), 2);
-               if let Event::PaymentPathFailed { ref payment_hash, .. } = events[0] {
-                       assert_eq!(*payment_hash, our_payment_hash);
-               } else { panic!("Unexpected event"); }
-               if let Event::PaymentFailed { ref payment_hash, .. } = events[1] {
-                       assert_eq!(*payment_hash, our_payment_hash);
-               } else { panic!("Unexpected event"); }
+               expect_payment_failed!(nodes[0], our_payment_hash, true);
        }
 }
 
@@ -6216,7 +5655,7 @@ fn test_fail_holding_cell_htlc_upon_free() {
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], max_can_send);
 
        // Send a payment which passes reserve checks but gets stuck in the holding cell.
-       let our_payment_id = nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
        chan_stat = get_channel_value_stat!(nodes[0], chan.2);
        assert_eq!(chan_stat.holding_cell_outbound_amount_msat, max_can_send);
 
@@ -6242,7 +5681,7 @@ fn test_fail_holding_cell_htlc_upon_free() {
        assert_eq!(events.len(), 1);
        match &events[0] {
                &Event::PaymentPathFailed { ref payment_id, ref payment_hash, ref payment_failed_permanently, ref network_update, ref all_paths_failed, ref short_channel_id, .. } => {
-                       assert_eq!(our_payment_id, *payment_id.as_ref().unwrap());
+                       assert_eq!(PaymentId(our_payment_hash.0), *payment_id.as_ref().unwrap());
                        assert_eq!(our_payment_hash.clone(), *payment_hash);
                        assert_eq!(*payment_failed_permanently, false);
                        assert_eq!(*all_paths_failed, true);
@@ -6296,10 +5735,11 @@ fn test_free_and_fail_holding_cell_htlcs() {
        let (route_2, payment_hash_2, _, payment_secret_2) = get_route_and_payment_hash!(nodes[0], nodes[1], amt_2);
 
        // Send 2 payments which pass reserve checks but get stuck in the holding cell.
-       nodes[0].node.send_payment(&route_1, payment_hash_1, &Some(payment_secret_1)).unwrap();
+       nodes[0].node.send_payment(&route_1, payment_hash_1, &Some(payment_secret_1), PaymentId(payment_hash_1.0)).unwrap();
        chan_stat = get_channel_value_stat!(nodes[0], chan.2);
        assert_eq!(chan_stat.holding_cell_outbound_amount_msat, amt_1);
-       let payment_id_2 = nodes[0].node.send_payment(&route_2, payment_hash_2, &Some(payment_secret_2)).unwrap();
+       let payment_id_2 = PaymentId(nodes[0].keys_manager.get_secure_random_bytes());
+       nodes[0].node.send_payment(&route_2, payment_hash_2, &Some(payment_secret_2), payment_id_2).unwrap();
        chan_stat = get_channel_value_stat!(nodes[0], chan.2);
        assert_eq!(chan_stat.holding_cell_outbound_amount_msat, amt_1 + amt_2);
 
@@ -6360,7 +5800,7 @@ fn test_free_and_fail_holding_cell_htlcs() {
        let events = nodes[1].node.get_and_clear_pending_events();
        assert_eq!(events.len(), 1);
        match events[0] {
-               Event::PaymentReceived { .. } => {},
+               Event::PaymentClaimable { .. } => {},
                _ => panic!("Unexpected event"),
        }
        nodes[1].node.claim_funds(payment_preimage_1);
@@ -6421,7 +5861,7 @@ fn test_fail_holding_cell_htlc_upon_free_multihop() {
        let max_can_send = 5000000 - channel_reserve - 2*commit_tx_fee_msat(feerate, 1 + 1, opt_anchors) - total_routing_fee_msat;
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[2], max_can_send);
        let payment_event = {
-               nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+               nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
                check_added_monitors!(nodes[0], 1);
 
                let mut events = nodes[0].node.get_and_clear_pending_msg_events();
@@ -6523,7 +5963,7 @@ fn test_update_add_htlc_bolt2_sender_value_below_minimum_msat() {
        let (mut route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 100000);
        route.paths[0][0].fee_msat = 100;
 
-       unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
+       unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)), true, APIError::ChannelUnavailable { ref err },
                assert!(regex::Regex::new(r"Cannot send less than their minimum HTLC value \(\d+\)").unwrap().is_match(err)));
        assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
        nodes[0].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "Cannot send less than their minimum HTLC value".to_string(), 1);
@@ -6540,7 +5980,7 @@ fn test_update_add_htlc_bolt2_sender_zero_value_msat() {
 
        let (mut route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 100000);
        route.paths[0][0].fee_msat = 0;
-       unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
+       unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)), true, APIError::ChannelUnavailable { ref err },
                assert_eq!(err, "Cannot send 0-msat HTLC"));
 
        assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
@@ -6557,7 +5997,7 @@ fn test_update_add_htlc_bolt2_receiver_zero_value_msat() {
        let _chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 100000);
-       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
        check_added_monitors!(nodes[0], 1);
        let mut updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
        updates.update_add_htlcs[0].amount_msat = 0;
@@ -6583,7 +6023,7 @@ fn test_update_add_htlc_bolt2_sender_cltv_expiry_too_high() {
                .with_features(channelmanager::provided_invoice_features());
        let (mut route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], payment_params, 100000000, 0);
        route.paths[0].last_mut().unwrap().cltv_expiry_delta = 500000001;
-       unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::RouteError { ref err },
+       unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)), true, APIError::InvalidRoute { ref err },
                assert_eq!(err, &"Channel CLTV overflowed?"));
 }
 
@@ -6602,7 +6042,7 @@ fn test_update_add_htlc_bolt2_sender_exceed_max_htlc_num_and_htlc_id_increment()
        for i in 0..max_accepted_htlcs {
                let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 100000);
                let payment_event = {
-                       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+                       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
                        check_added_monitors!(nodes[0], 1);
 
                        let mut events = nodes[0].node.get_and_clear_pending_msg_events();
@@ -6619,10 +6059,10 @@ fn test_update_add_htlc_bolt2_sender_exceed_max_htlc_num_and_htlc_id_increment()
                commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
 
                expect_pending_htlcs_forwardable!(nodes[1]);
-               expect_payment_received!(nodes[1], our_payment_hash, our_payment_secret, 100000);
+               expect_payment_claimable!(nodes[1], our_payment_hash, our_payment_secret, 100000);
        }
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 100000);
-       unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
+       unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)), true, APIError::ChannelUnavailable { ref err },
                assert!(regex::Regex::new(r"Cannot push more than their max accepted HTLCs \(\d+\)").unwrap().is_match(err)));
 
        assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
@@ -6646,7 +6086,7 @@ fn test_update_add_htlc_bolt2_sender_exceed_max_htlc_value_in_flight() {
        // Manually create a route over our max in flight (which our router normally automatically
        // limits us to.
        route.paths[0][0].fee_msat =  max_in_flight + 1;
-       unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
+       unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)), true, APIError::ChannelUnavailable { ref err },
                assert!(regex::Regex::new(r"Cannot send value that would put us over the max HTLC value in flight our peer will accept \(\d+\)").unwrap().is_match(err)));
 
        assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
@@ -6672,7 +6112,7 @@ fn test_update_add_htlc_bolt2_receiver_check_amount_received_more_than_min() {
        }
 
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], htlc_minimum_msat);
-       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
        check_added_monitors!(nodes[0], 1);
        let mut updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
        updates.update_add_htlcs[0].amount_msat = htlc_minimum_msat-1;
@@ -6702,7 +6142,7 @@ fn test_update_add_htlc_bolt2_receiver_sender_can_afford_amount_sent() {
 
        let max_can_send = 5000000 - channel_reserve - commit_tx_fee_outbound;
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], max_can_send);
-       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
        check_added_monitors!(nodes[0], 1);
        let mut updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
 
@@ -6769,7 +6209,7 @@ fn test_update_add_htlc_bolt2_receiver_check_max_in_flight_msat() {
        let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 1000000, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 1000000);
-       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
        check_added_monitors!(nodes[0], 1);
        let mut updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
        updates.update_add_htlcs[0].amount_msat = get_channel_value_stat!(nodes[1], chan.2).counterparty_max_htlc_value_in_flight_msat + 1;
@@ -6792,7 +6232,7 @@ fn test_update_add_htlc_bolt2_receiver_check_cltv_expiry() {
 
        create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, channelmanager::provided_init_features(), channelmanager::provided_init_features());
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 1000000);
-       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
        check_added_monitors!(nodes[0], 1);
        let mut updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
        updates.update_add_htlcs[0].cltv_expiry = 500000000;
@@ -6817,7 +6257,7 @@ fn test_update_add_htlc_bolt2_receiver_check_repeated_id_ignore() {
 
        create_announced_chan_between_nodes(&nodes, 0, 1, channelmanager::provided_init_features(), channelmanager::provided_init_features());
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 1000000);
-       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
        check_added_monitors!(nodes[0], 1);
        let updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
        nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
@@ -6862,7 +6302,7 @@ fn test_update_fulfill_htlc_bolt2_update_fulfill_htlc_before_commitment() {
        let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
        let chan = create_announced_chan_between_nodes(&nodes, 0, 1, channelmanager::provided_init_features(), channelmanager::provided_init_features());
        let (route, our_payment_hash, our_payment_preimage, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 1000000);
-       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
 
        check_added_monitors!(nodes[0], 1);
        let updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
@@ -6894,7 +6334,7 @@ fn test_update_fulfill_htlc_bolt2_update_fail_htlc_before_commitment() {
        let chan = create_announced_chan_between_nodes(&nodes, 0, 1, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 1000000);
-       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
        check_added_monitors!(nodes[0], 1);
        let updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
        nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
@@ -6925,7 +6365,7 @@ fn test_update_fulfill_htlc_bolt2_update_fail_malformed_htlc_before_commitment()
        let chan = create_announced_chan_between_nodes(&nodes, 0, 1, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 1000000);
-       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
        check_added_monitors!(nodes[0], 1);
        let updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
        nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
@@ -7042,7 +6482,7 @@ fn test_update_fulfill_htlc_bolt2_missing_badonion_bit_for_malformed_htlc_messag
        create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 1000000, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 
        let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 1000000);
-       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
        check_added_monitors!(nodes[0], 1);
 
        let mut updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
@@ -7093,7 +6533,7 @@ fn test_update_fulfill_htlc_bolt2_after_malformed_htlc_message_must_forward_upda
 
        //First hop
        let mut payment_event = {
-               nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+               nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
                check_added_monitors!(nodes[0], 1);
                let mut events = nodes[0].node.get_and_clear_pending_msg_events();
                assert_eq!(events.len(), 1);
@@ -7167,7 +6607,7 @@ fn test_channel_failed_after_message_with_badonion_node_perm_bits_set() {
 
        // First hop
        let mut payment_event = {
-               nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+               nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
                check_added_monitors!(nodes[0], 1);
                SendEvent::from_node(&nodes[0])
        };
@@ -7477,156 +6917,6 @@ fn test_user_configurable_csv_delay() {
        } else { assert!(false); }
 }
 
-fn do_test_data_loss_protect(reconnect_panicing: bool) {
-       // When we get a data_loss_protect proving we're behind, we immediately panic as the
-       // chain::Watch API requirements have been violated (e.g. the user restored from a backup). The
-       // panic message informs the user they should force-close without broadcasting, which is tested
-       // if `reconnect_panicing` is not set.
-       let persister;
-       let logger;
-       let fee_estimator;
-       let tx_broadcaster;
-       let chain_source;
-       let mut chanmon_cfgs = create_chanmon_cfgs(2);
-       // We broadcast during Drop because chanmon is out of sync with chanmgr, which would cause a panic
-       // during signing due to revoked tx
-       chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
-       let keys_manager = &chanmon_cfgs[0].keys_manager;
-       let monitor;
-       let node_state_0;
-       let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
-       let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
-       let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
-
-       let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 1000000, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-
-       // Cache node A state before any channel update
-       let previous_node_state = nodes[0].node.encode();
-       let mut previous_chain_monitor_state = test_utils::TestVecWriter(Vec::new());
-       get_monitor!(nodes[0], chan.2).write(&mut previous_chain_monitor_state).unwrap();
-
-       send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
-       send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
-
-       nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
-       nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
-
-       // Restore node A from previous state
-       logger = test_utils::TestLogger::with_id(format!("node {}", 0));
-       let mut chain_monitor = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(&mut io::Cursor::new(previous_chain_monitor_state.0), keys_manager).unwrap().1;
-       chain_source = test_utils::TestChainSource::new(Network::Testnet);
-       tx_broadcaster = test_utils::TestBroadcaster { txn_broadcasted: Mutex::new(Vec::new()), blocks: Arc::new(Mutex::new(Vec::new())) };
-       fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) };
-       persister = test_utils::TestPersister::new();
-       monitor = test_utils::TestChainMonitor::new(Some(&chain_source), &tx_broadcaster, &logger, &fee_estimator, &persister, keys_manager);
-       node_state_0 = {
-               let mut channel_monitors = HashMap::new();
-               channel_monitors.insert(OutPoint { txid: chan.3.txid(), index: 0 }, &mut chain_monitor);
-               <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut io::Cursor::new(previous_node_state), ChannelManagerReadArgs {
-                       keys_manager: keys_manager,
-                       fee_estimator: &fee_estimator,
-                       chain_monitor: &monitor,
-                       logger: &logger,
-                       tx_broadcaster: &tx_broadcaster,
-                       default_config: UserConfig::default(),
-                       channel_monitors,
-               }).unwrap().1
-       };
-       nodes[0].node = &node_state_0;
-       assert!(monitor.watch_channel(OutPoint { txid: chan.3.txid(), index: 0 }, chain_monitor).is_ok());
-       nodes[0].chain_monitor = &monitor;
-       nodes[0].chain_source = &chain_source;
-
-       check_added_monitors!(nodes[0], 1);
-
-       if reconnect_panicing {
-               nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-               nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-
-               let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
-
-               // Check we close channel detecting A is fallen-behind
-               // Check that we sent the warning message when we detected that A has fallen behind,
-               // and give the possibility for A to recover from the warning.
-               nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]);
-               let warn_msg = "Peer attempted to reestablish channel with a very old local commitment transaction".to_owned();
-               assert!(check_warn_msg!(nodes[1], nodes[0].node.get_our_node_id(), chan.2).contains(&warn_msg));
-
-               {
-                       let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().clone();
-                       // The node B should not broadcast the transaction to force close the channel!
-                       assert!(node_txn.is_empty());
-               }
-
-               let reestablish_0 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
-               // Check A panics upon seeing proof it has fallen behind.
-               nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_0[0]);
-               return; // By this point we should have panic'ed!
-       }
-
-       nodes[0].node.force_close_without_broadcasting_txn(&chan.2, &nodes[1].node.get_our_node_id()).unwrap();
-       check_added_monitors!(nodes[0], 1);
-       check_closed_event!(nodes[0], 1, ClosureReason::HolderForceClosed);
-       {
-               let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
-               assert_eq!(node_txn.len(), 0);
-       }
-
-       for msg in nodes[0].node.get_and_clear_pending_msg_events() {
-               if let MessageSendEvent::BroadcastChannelUpdate { .. } = msg {
-               } else if let MessageSendEvent::HandleError { ref action, .. } = msg {
-                       match action {
-                               &ErrorAction::SendErrorMessage { ref msg } => {
-                                       assert_eq!(msg.data, "Channel force-closed");
-                               },
-                               _ => panic!("Unexpected event!"),
-                       }
-               } else {
-                       panic!("Unexpected event {:?}", msg)
-               }
-       }
-
-       // after the warning message sent by B, we should not able to
-       // use the channel, or reconnect with success to the channel.
-       assert!(nodes[0].node.list_usable_channels().is_empty());
-       nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-       nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-       let retry_reestablish = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
-
-       nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &retry_reestablish[0]);
-       let mut err_msgs_0 = Vec::with_capacity(1);
-       for msg in nodes[0].node.get_and_clear_pending_msg_events() {
-               if let MessageSendEvent::HandleError { ref action, .. } = msg {
-                       match action {
-                               &ErrorAction::SendErrorMessage { ref msg } => {
-                                       assert_eq!(msg.data, "Failed to find corresponding channel");
-                                       err_msgs_0.push(msg.clone());
-                               },
-                               _ => panic!("Unexpected event!"),
-                       }
-               } else {
-                       panic!("Unexpected event!");
-               }
-       }
-       assert_eq!(err_msgs_0.len(), 1);
-       nodes[1].node.handle_error(&nodes[0].node.get_our_node_id(), &err_msgs_0[0]);
-       assert!(nodes[1].node.list_usable_channels().is_empty());
-       check_added_monitors!(nodes[1], 1);
-       check_closed_event!(nodes[1], 1, ClosureReason::CounterpartyForceClosed { peer_msg: "Failed to find corresponding channel".to_owned() });
-       check_closed_broadcast!(nodes[1], false);
-}
-
-#[test]
-#[should_panic]
-fn test_data_loss_protect_showing_stale_state_panics() {
-       do_test_data_loss_protect(true);
-}
-
-#[test]
-fn test_force_close_without_broadcast() {
-       do_test_data_loss_protect(false);
-}
-
 #[test]
 fn test_check_htlc_underpaying() {
        // Send payment through A -> B but A is maliciously
@@ -7647,7 +6937,7 @@ fn test_check_htlc_underpaying() {
        let route = get_route(&nodes[0].node.get_our_node_id(), &payment_params, &nodes[0].network_graph.read_only(), None, 10_000, TEST_FINAL_CLTV, nodes[0].logger, &scorer, &random_seed_bytes).unwrap();
        let (_, our_payment_hash, _) = get_payment_preimage_hash!(nodes[0]);
        let our_payment_secret = nodes[1].node.create_inbound_payment_for_hash(our_payment_hash, Some(100_000), 7200).unwrap();
-       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
        check_added_monitors!(nodes[0], 1);
 
        let mut events = nodes[0].node.get_and_clear_pending_msg_events();
@@ -7684,8 +6974,8 @@ fn test_check_htlc_underpaying() {
        commitment_signed_dance!(nodes[0], nodes[1], commitment_signed, false, true);
 
        // 10_000 msat as u64, followed by a height of CHAN_CONFIRM_DEPTH as u32
-       let mut expected_failure_data = byte_utils::be64_to_array(10_000).to_vec();
-       expected_failure_data.extend_from_slice(&byte_utils::be32_to_array(CHAN_CONFIRM_DEPTH));
+       let mut expected_failure_data = (10_000 as u64).to_be_bytes().to_vec();
+       expected_failure_data.extend_from_slice(&CHAN_CONFIRM_DEPTH.to_be_bytes());
        expect_payment_failed!(nodes[0], our_payment_hash, true, 0x4000|15, &expected_failure_data[..]);
 }
 
@@ -7994,22 +7284,6 @@ fn test_bump_penalty_txn_on_revoked_htlcs() {
        connect_block(&nodes[0], &Block { header: header_130, txdata: penalty_txn });
        let header_131 = BlockHeader { version: 0x20000000, prev_blockhash: header_130.block_hash(), merkle_root: TxMerkleNode::all_zeros(), time: 42, bits: 42, nonce: 42 };
        connect_block(&nodes[0], &Block { header: header_131, txdata: Vec::new() });
-       {
-               let mut node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
-               assert_eq!(node_txn.len(), 2); // 2 bumped penalty txn on revoked commitment tx
-
-               check_spends!(node_txn[0], revoked_local_txn[0]);
-               check_spends!(node_txn[1], revoked_local_txn[0]);
-               // Note that these are both bogus - they spend outputs already claimed in block 129:
-               if node_txn[0].input[0].previous_output == revoked_htlc_txn[0].input[0].previous_output  {
-                       assert_eq!(node_txn[1].input[0].previous_output, revoked_htlc_txn[2].input[0].previous_output);
-               } else {
-                       assert_eq!(node_txn[0].input[0].previous_output, revoked_htlc_txn[2].input[0].previous_output);
-                       assert_eq!(node_txn[1].input[0].previous_output, revoked_htlc_txn[0].input[0].previous_output);
-               }
-
-               node_txn.clear();
-       };
 
        // Few more blocks to confirm penalty txn
        connect_blocks(&nodes[0], 4);
@@ -8284,7 +7558,7 @@ fn test_pending_claimed_htlc_no_balance_underflow() {
        route.payment_params = None; // This is all wrong, but unnecessary
        route.paths[0][0].pubkey = nodes[0].node.get_our_node_id();
        let (_, payment_hash_2, payment_secret_2) = get_payment_preimage_hash!(nodes[0]);
-       nodes[1].node.send_payment(&route, payment_hash_2, &Some(payment_secret_2)).unwrap();
+       nodes[1].node.send_payment(&route, payment_hash_2, &Some(payment_secret_2), PaymentId(payment_hash_2.0)).unwrap();
 
        assert_eq!(nodes[1].node.list_channels()[0].balance_msat, 1_000_000);
 }
@@ -8667,7 +7941,7 @@ fn test_preimage_storage() {
        {
                let (payment_hash, payment_secret) = nodes[1].node.create_inbound_payment(Some(100_000), 7200).unwrap();
                let (route, _, _, _) = get_route_and_payment_hash!(nodes[0], nodes[1], 100_000);
-               nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
+               nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret), PaymentId(payment_hash.0)).unwrap();
                check_added_monitors!(nodes[0], 1);
                let mut events = nodes[0].node.get_and_clear_pending_msg_events();
                let mut payment_event = SendEvent::from_event(events.pop().unwrap());
@@ -8680,7 +7954,7 @@ fn test_preimage_storage() {
        let events = nodes[1].node.get_and_clear_pending_events();
        assert_eq!(events.len(), 1);
        match events[0] {
-               Event::PaymentReceived { ref purpose, .. } => {
+               Event::PaymentClaimable { ref purpose, .. } => {
                        match &purpose {
                                PaymentPurpose::InvoicePayment { payment_preimage, .. } => {
                                        claim_payment(&nodes[0], &[&nodes[1]], payment_preimage.unwrap());
@@ -8737,7 +8011,7 @@ fn test_secret_timeout() {
 
        {
                let (route, _, _, _) = get_route_and_payment_hash!(nodes[0], nodes[1], 100_000);
-               nodes[0].node.send_payment(&route, payment_hash, &Some(our_payment_secret)).unwrap();
+               nodes[0].node.send_payment(&route, payment_hash, &Some(our_payment_secret), PaymentId(payment_hash.0)).unwrap();
                check_added_monitors!(nodes[0], 1);
                let mut events = nodes[0].node.get_and_clear_pending_msg_events();
                let mut payment_event = SendEvent::from_event(events.pop().unwrap());
@@ -8750,7 +8024,7 @@ fn test_secret_timeout() {
        let events = nodes[1].node.get_and_clear_pending_events();
        assert_eq!(events.len(), 1);
        match events[0] {
-               Event::PaymentReceived { purpose: PaymentPurpose::InvoicePayment { payment_preimage, payment_secret }, .. } => {
+               Event::PaymentClaimable { purpose: PaymentPurpose::InvoicePayment { payment_preimage, payment_secret }, .. } => {
                        assert!(payment_preimage.is_none());
                        assert_eq!(payment_secret, our_payment_secret);
                        // We don't actually have the payment preimage with which to claim this payment!
@@ -8807,17 +8081,17 @@ fn test_bad_secret_hash() {
        let expected_error_data = [0, 0, 0, 0, 0, 1, 0x86, 0xa0, 0, 0, 0, CHAN_CONFIRM_DEPTH as u8];
 
        // Send a payment with the right payment hash but the wrong payment secret
-       nodes[0].node.send_payment(&route, our_payment_hash, &Some(random_payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, our_payment_hash, &Some(random_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
        handle_unknown_invalid_payment_data!(our_payment_hash);
        expect_payment_failed!(nodes[0], our_payment_hash, true, expected_error_code, expected_error_data);
 
        // Send a payment with a random payment hash, but the right payment secret
-       nodes[0].node.send_payment(&route, random_payment_hash, &Some(our_payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, random_payment_hash, &Some(our_payment_secret), PaymentId(random_payment_hash.0)).unwrap();
        handle_unknown_invalid_payment_data!(random_payment_hash);
        expect_payment_failed!(nodes[0], random_payment_hash, true, expected_error_code, expected_error_data);
 
        // Send a payment with a random payment hash and random payment secret
-       nodes[0].node.send_payment(&route, random_payment_hash, &Some(random_payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, random_payment_hash, &Some(random_payment_secret), PaymentId(random_payment_hash.0)).unwrap();
        handle_unknown_invalid_payment_data!(random_payment_hash);
        expect_payment_failed!(nodes[0], random_payment_hash, true, expected_error_code, expected_error_data);
 }
@@ -8826,7 +8100,8 @@ fn test_bad_secret_hash() {
 fn test_update_err_monitor_lockdown() {
        // Our monitor will lock update of local commitment transaction if a broadcastion condition
        // has been fulfilled (either force-close from Channel or block height requiring a HTLC-
-       // timeout). Trying to update monitor after lockdown should return a ChannelMonitorUpdateErr.
+       // timeout). Trying to update monitor after lockdown should return a ChannelMonitorUpdateStatus
+       // error.
        //
        // This scenario may happen in a watchtower setup, where watchtower process a block height
        // triggering a timeout while a slow-block-processing ChannelManager receives a local signed
@@ -8856,10 +8131,10 @@ fn test_update_err_monitor_lockdown() {
                let mut w = test_utils::TestVecWriter(Vec::new());
                monitor.write(&mut w).unwrap();
                let new_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingSigner>)>::read(
-                               &mut io::Cursor::new(&w.0), &test_utils::OnlyReadsKeysInterface {}).unwrap().1;
+                               &mut io::Cursor::new(&w.0), nodes[0].keys_manager).unwrap().1;
                assert!(new_monitor == *monitor);
                let watchtower = test_utils::TestChainMonitor::new(Some(&chain_source), &chanmon_cfgs[0].tx_broadcaster, &logger, &chanmon_cfgs[0].fee_estimator, &persister, &node_cfgs[0].keys_manager);
-               assert!(watchtower.watch_channel(outpoint, new_monitor).is_ok());
+               assert_eq!(watchtower.watch_channel(outpoint, new_monitor), ChannelMonitorUpdateStatus::Completed);
                watchtower
        };
        let header = BlockHeader { version: 0x20000000, prev_blockhash: BlockHash::all_zeros(), merkle_root: TxMerkleNode::all_zeros(), time: 42, bits: 42, nonce: 42 };
@@ -8879,8 +8154,8 @@ fn test_update_err_monitor_lockdown() {
        nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &updates.update_fulfill_htlcs[0]);
        if let Some(ref mut channel) = nodes[0].node.channel_state.lock().unwrap().by_id.get_mut(&chan_1.2) {
                if let Ok((_, _, update)) = channel.commitment_signed(&updates.commitment_signed, &node_cfgs[0].logger) {
-                       if let Err(_) =  watchtower.chain_monitor.update_channel(outpoint, update.clone()) {} else { assert!(false); }
-                       if let Ok(_) = nodes[0].chain_monitor.update_channel(outpoint, update) {} else { assert!(false); }
+                       assert_eq!(watchtower.chain_monitor.update_channel(outpoint, update.clone()), ChannelMonitorUpdateStatus::PermanentFailure);
+                       assert_eq!(nodes[0].chain_monitor.update_channel(outpoint, update), ChannelMonitorUpdateStatus::Completed);
                } else { assert!(false); }
        } else { assert!(false); };
        // Our local monitor is in-sync and hasn't processed yet timeout
@@ -8920,10 +8195,10 @@ fn test_concurrent_monitor_claim() {
                let mut w = test_utils::TestVecWriter(Vec::new());
                monitor.write(&mut w).unwrap();
                let new_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingSigner>)>::read(
-                               &mut io::Cursor::new(&w.0), &test_utils::OnlyReadsKeysInterface {}).unwrap().1;
+                               &mut io::Cursor::new(&w.0), nodes[0].keys_manager).unwrap().1;
                assert!(new_monitor == *monitor);
                let watchtower = test_utils::TestChainMonitor::new(Some(&chain_source), &chanmon_cfgs[0].tx_broadcaster, &logger, &chanmon_cfgs[0].fee_estimator, &persister, &node_cfgs[0].keys_manager);
-               assert!(watchtower.watch_channel(outpoint, new_monitor).is_ok());
+               assert_eq!(watchtower.watch_channel(outpoint, new_monitor), ChannelMonitorUpdateStatus::Completed);
                watchtower
        };
        let header = BlockHeader { version: 0x20000000, prev_blockhash: BlockHash::all_zeros(), merkle_root: TxMerkleNode::all_zeros(), time: 42, bits: 42, nonce: 42 };
@@ -8949,10 +8224,10 @@ fn test_concurrent_monitor_claim() {
                let mut w = test_utils::TestVecWriter(Vec::new());
                monitor.write(&mut w).unwrap();
                let new_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingSigner>)>::read(
-                               &mut io::Cursor::new(&w.0), &test_utils::OnlyReadsKeysInterface {}).unwrap().1;
+                               &mut io::Cursor::new(&w.0), nodes[0].keys_manager).unwrap().1;
                assert!(new_monitor == *monitor);
                let watchtower = test_utils::TestChainMonitor::new(Some(&chain_source), &chanmon_cfgs[0].tx_broadcaster, &logger, &chanmon_cfgs[0].fee_estimator, &persister, &node_cfgs[0].keys_manager);
-               assert!(watchtower.watch_channel(outpoint, new_monitor).is_ok());
+               assert_eq!(watchtower.watch_channel(outpoint, new_monitor), ChannelMonitorUpdateStatus::Completed);
                watchtower
        };
        let header = BlockHeader { version: 0x20000000, prev_blockhash: BlockHash::all_zeros(), merkle_root: TxMerkleNode::all_zeros(), time: 42, bits: 42, nonce: 42 };
@@ -8961,7 +8236,7 @@ fn test_concurrent_monitor_claim() {
        // Route another payment to generate another update with still previous HTLC pending
        let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], 3000000);
        {
-               nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
+               nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret), PaymentId(payment_hash.0)).unwrap();
        }
        check_added_monitors!(nodes[1], 1);
 
@@ -8971,9 +8246,9 @@ fn test_concurrent_monitor_claim() {
        if let Some(ref mut channel) = nodes[0].node.channel_state.lock().unwrap().by_id.get_mut(&chan_1.2) {
                if let Ok((_, _, update)) = channel.commitment_signed(&updates.commitment_signed, &node_cfgs[0].logger) {
                        // Watchtower Alice should already have seen the block and reject the update
-                       if let Err(_) =  watchtower_alice.chain_monitor.update_channel(outpoint, update.clone()) {} else { assert!(false); }
-                       if let Ok(_) = watchtower_bob.chain_monitor.update_channel(outpoint, update.clone()) {} else { assert!(false); }
-                       if let Ok(_) = nodes[0].chain_monitor.update_channel(outpoint, update) {} else { assert!(false); }
+                       assert_eq!(watchtower_alice.chain_monitor.update_channel(outpoint, update.clone()), ChannelMonitorUpdateStatus::PermanentFailure);
+                       assert_eq!(watchtower_bob.chain_monitor.update_channel(outpoint, update.clone()), ChannelMonitorUpdateStatus::Completed);
+                       assert_eq!(nodes[0].chain_monitor.update_channel(outpoint, update), ChannelMonitorUpdateStatus::Completed);
                } else { assert!(false); }
        } else { assert!(false); };
        // Our local monitor is in-sync and hasn't processed yet timeout
@@ -9034,7 +8309,7 @@ fn test_pre_lockin_no_chan_closed_update() {
        check_added_monitors!(nodes[0], 0);
 
        let funding_created_msg = get_event_msg!(nodes[0], MessageSendEvent::SendFundingCreated, nodes[1].node.get_our_node_id());
-       let channel_id = ::chain::transaction::OutPoint { txid: funding_created_msg.funding_txid, index: funding_created_msg.funding_output_index }.to_channel_id();
+       let channel_id = crate::chain::transaction::OutPoint { txid: funding_created_msg.funding_txid, index: funding_created_msg.funding_output_index }.to_channel_id();
        nodes[0].node.handle_error(&nodes[1].node.get_our_node_id(), &msgs::ErrorMessage { channel_id, data: "Hi".to_owned() });
        assert!(nodes[0].chain_monitor.added_monitors.lock().unwrap().is_empty());
        check_closed_event!(nodes[0], 2, ClosureReason::CounterpartyForceClosed { peer_msg: "Hi".to_string() }, true);
@@ -9340,7 +8615,7 @@ fn test_duplicate_chan_id() {
        }
        let funding_signed_msg = get_event_msg!(nodes[1], MessageSendEvent::SendFundingSigned, nodes[0].node.get_our_node_id());
 
-       let funding_outpoint = ::chain::transaction::OutPoint { txid: funding_created_msg.funding_txid, index: funding_created_msg.funding_output_index };
+       let funding_outpoint = crate::chain::transaction::OutPoint { txid: funding_created_msg.funding_txid, index: funding_created_msg.funding_output_index };
        let channel_id = funding_outpoint.to_channel_id();
 
        // Now we have the first channel past funding_created (ie it has a txid-based channel_id, not a
@@ -9421,6 +8696,7 @@ fn test_duplicate_chan_id() {
        let (channel_ready, _) = create_chan_between_nodes_with_value_confirm(&nodes[0], &nodes[1], &tx);
        let (announcement, as_update, bs_update) = create_chan_between_nodes_with_value_b(&nodes[0], &nodes[1], &channel_ready);
        update_nodes_with_chan_announce(&nodes, 0, 1, &announcement, &as_update, &bs_update);
+
        send_payment(&nodes[0], &[&nodes[1]], 8000000);
 }
 
@@ -9659,121 +8935,6 @@ fn test_tx_confirmed_skipping_blocks_immediate_broadcast() {
        do_test_tx_confirmed_skipping_blocks_immediate_broadcast(true);
 }
 
-#[test]
-fn test_forwardable_regen() {
-       // Tests that if we reload a ChannelManager while forwards are pending we will regenerate the
-       // PendingHTLCsForwardable event automatically, ensuring we don't forget to forward/receive
-       // HTLCs.
-       // We test it for both payment receipt and payment forwarding.
-
-       let chanmon_cfgs = create_chanmon_cfgs(3);
-       let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
-       let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
-       let persister: test_utils::TestPersister;
-       let new_chain_monitor: test_utils::TestChainMonitor;
-       let nodes_1_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
-       let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
-       let chan_id_1 = create_announced_chan_between_nodes(&nodes, 0, 1, channelmanager::provided_init_features(), channelmanager::provided_init_features()).2;
-       let chan_id_2 = create_announced_chan_between_nodes(&nodes, 1, 2, channelmanager::provided_init_features(), channelmanager::provided_init_features()).2;
-
-       // First send a payment to nodes[1]
-       let (route, payment_hash, payment_preimage, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 100_000);
-       nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
-       check_added_monitors!(nodes[0], 1);
-
-       let mut events = nodes[0].node.get_and_clear_pending_msg_events();
-       assert_eq!(events.len(), 1);
-       let payment_event = SendEvent::from_event(events.pop().unwrap());
-       nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
-       commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
-
-       expect_pending_htlcs_forwardable_ignore!(nodes[1]);
-
-       // Next send a payment which is forwarded by nodes[1]
-       let (route_2, payment_hash_2, payment_preimage_2, payment_secret_2) = get_route_and_payment_hash!(nodes[0], nodes[2], 200_000);
-       nodes[0].node.send_payment(&route_2, payment_hash_2, &Some(payment_secret_2)).unwrap();
-       check_added_monitors!(nodes[0], 1);
-
-       let mut events = nodes[0].node.get_and_clear_pending_msg_events();
-       assert_eq!(events.len(), 1);
-       let payment_event = SendEvent::from_event(events.pop().unwrap());
-       nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
-       commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
-
-       // There is already a PendingHTLCsForwardable event "pending" so another one will not be
-       // generated
-       assert!(nodes[1].node.get_and_clear_pending_events().is_empty());
-
-       // Now restart nodes[1] and make sure it regenerates a single PendingHTLCsForwardable
-       nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
-       nodes[2].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
-
-       let nodes_1_serialized = nodes[1].node.encode();
-       let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
-       let mut chan_1_monitor_serialized = test_utils::TestVecWriter(Vec::new());
-       get_monitor!(nodes[1], chan_id_1).write(&mut chan_0_monitor_serialized).unwrap();
-       get_monitor!(nodes[1], chan_id_2).write(&mut chan_1_monitor_serialized).unwrap();
-
-       persister = test_utils::TestPersister::new();
-       let keys_manager = &chanmon_cfgs[1].keys_manager;
-       new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[1].chain_source), nodes[1].tx_broadcaster.clone(), nodes[1].logger, node_cfgs[1].fee_estimator, &persister, keys_manager);
-       nodes[1].chain_monitor = &new_chain_monitor;
-
-       let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
-       let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(
-               &mut chan_0_monitor_read, keys_manager).unwrap();
-       assert!(chan_0_monitor_read.is_empty());
-       let mut chan_1_monitor_read = &chan_1_monitor_serialized.0[..];
-       let (_, mut chan_1_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(
-               &mut chan_1_monitor_read, keys_manager).unwrap();
-       assert!(chan_1_monitor_read.is_empty());
-
-       let mut nodes_1_read = &nodes_1_serialized[..];
-       let (_, nodes_1_deserialized_tmp) = {
-               let mut channel_monitors = HashMap::new();
-               channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
-               channel_monitors.insert(chan_1_monitor.get_funding_txo().0, &mut chan_1_monitor);
-               <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_1_read, ChannelManagerReadArgs {
-                       default_config: UserConfig::default(),
-                       keys_manager,
-                       fee_estimator: node_cfgs[1].fee_estimator,
-                       chain_monitor: nodes[1].chain_monitor,
-                       tx_broadcaster: nodes[1].tx_broadcaster.clone(),
-                       logger: nodes[1].logger,
-                       channel_monitors,
-               }).unwrap()
-       };
-       nodes_1_deserialized = nodes_1_deserialized_tmp;
-       assert!(nodes_1_read.is_empty());
-
-       assert!(nodes[1].chain_monitor.watch_channel(chan_0_monitor.get_funding_txo().0, chan_0_monitor).is_ok());
-       assert!(nodes[1].chain_monitor.watch_channel(chan_1_monitor.get_funding_txo().0, chan_1_monitor).is_ok());
-       nodes[1].node = &nodes_1_deserialized;
-       check_added_monitors!(nodes[1], 2);
-
-       reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
-       // Note that nodes[1] and nodes[2] resend their channel_ready here since they haven't updated
-       // the commitment state.
-       reconnect_nodes(&nodes[1], &nodes[2], (true, true), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
-
-       assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
-
-       expect_pending_htlcs_forwardable!(nodes[1]);
-       expect_payment_received!(nodes[1], payment_hash, payment_secret, 100_000);
-       check_added_monitors!(nodes[1], 1);
-
-       let mut events = nodes[1].node.get_and_clear_pending_msg_events();
-       assert_eq!(events.len(), 1);
-       let payment_event = SendEvent::from_event(events.pop().unwrap());
-       nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event.msgs[0]);
-       commitment_signed_dance!(nodes[2], nodes[1], payment_event.commitment_msg, false);
-       expect_pending_htlcs_forwardable!(nodes[2]);
-       expect_payment_received!(nodes[2], payment_hash_2, payment_secret_2, 200_000);
-
-       claim_payment(&nodes[0], &[&nodes[1]], payment_preimage);
-       claim_payment(&nodes[0], &[&nodes[1], &nodes[2]], payment_preimage_2);
-}
-
 fn do_test_dup_htlc_second_rejected(test_for_second_fail_panic: bool) {
        let chanmon_cfgs = create_chanmon_cfgs(2);
        let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
@@ -9789,7 +8950,7 @@ fn do_test_dup_htlc_second_rejected(test_for_second_fail_panic: bool) {
        let (our_payment_preimage, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(&nodes[1]);
 
        {
-               nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+               nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).unwrap();
                check_added_monitors!(nodes[0], 1);
                let mut events = nodes[0].node.get_and_clear_pending_msg_events();
                assert_eq!(events.len(), 1);
@@ -9798,10 +8959,11 @@ fn do_test_dup_htlc_second_rejected(test_for_second_fail_panic: bool) {
                commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
        }
        expect_pending_htlcs_forwardable!(nodes[1]);
-       expect_payment_received!(nodes[1], our_payment_hash, our_payment_secret, 10_000);
+       expect_payment_claimable!(nodes[1], our_payment_hash, our_payment_secret, 10_000);
 
        {
-               nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
+               // Note that we use a different PaymentId here to allow us to duplicativly pay
+               nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_secret.0)).unwrap();
                check_added_monitors!(nodes[0], 1);
                let mut events = nodes[0].node.get_and_clear_pending_msg_events();
                assert_eq!(events.len(), 1);
@@ -9859,7 +9021,7 @@ fn do_test_dup_htlc_second_rejected(test_for_second_fail_panic: bool) {
 #[test]
 fn test_dup_htlc_second_fail_panic() {
        // Previously, if we received two HTLCs back-to-back, where the second overran the expected
-       // value for the payment, we'd fail back both HTLCs after generating a `PaymentReceived` event.
+       // value for the payment, we'd fail back both HTLCs after generating a `PaymentClaimable` event.
        // Then, if the user failed the second payment, they'd hit a "tried to fail an already failed
        // HTLC" debug panic. This tests for this behavior, checking that only one HTLC is auto-failed.
        do_test_dup_htlc_second_rejected(true);
@@ -9901,8 +9063,16 @@ fn test_inconsistent_mpp_params() {
 
        let cur_height = nodes[0].best_block_info().1;
        let payment_id = PaymentId([42; 32]);
+
+       let session_privs = {
+               // We create a fake route here so that we start with three pending HTLCs, which we'll
+               // ultimately have, just not right away.
+               let mut dup_route = route.clone();
+               dup_route.paths.push(route.paths[1].clone());
+               nodes[0].node.test_add_new_pending_payment(our_payment_hash, Some(our_payment_secret), payment_id, &dup_route).unwrap()
+       };
        {
-               nodes[0].node.send_payment_along_path(&route.paths[0], &payment_params_opt, &our_payment_hash, &Some(our_payment_secret), 15_000_000, cur_height, payment_id, &None).unwrap();
+               nodes[0].node.send_payment_along_path(&route.paths[0], &payment_params_opt, &our_payment_hash, &Some(our_payment_secret), 15_000_000, cur_height, payment_id, &None, session_privs[0]).unwrap();
                check_added_monitors!(nodes[0], 1);
 
                let mut events = nodes[0].node.get_and_clear_pending_msg_events();
@@ -9912,7 +9082,7 @@ fn test_inconsistent_mpp_params() {
        assert!(nodes[3].node.get_and_clear_pending_events().is_empty());
 
        {
-               nodes[0].node.send_payment_along_path(&route.paths[1], &payment_params_opt, &our_payment_hash, &Some(our_payment_secret), 14_000_000, cur_height, payment_id, &None).unwrap();
+               nodes[0].node.send_payment_along_path(&route.paths[1], &payment_params_opt, &our_payment_hash, &Some(our_payment_secret), 14_000_000, cur_height, payment_id, &None, session_privs[1]).unwrap();
                check_added_monitors!(nodes[0], 1);
 
                let mut events = nodes[0].node.get_and_clear_pending_msg_events();
@@ -9957,7 +9127,7 @@ fn test_inconsistent_mpp_params() {
 
        expect_payment_failed_conditions(&nodes[0], our_payment_hash, true, PaymentFailedConditions::new().mpp_parts_remain());
 
-       nodes[0].node.send_payment_along_path(&route.paths[1], &payment_params_opt, &our_payment_hash, &Some(our_payment_secret), 15_000_000, cur_height, payment_id, &None).unwrap();
+       nodes[0].node.send_payment_along_path(&route.paths[1], &payment_params_opt, &our_payment_hash, &Some(our_payment_secret), 15_000_000, cur_height, payment_id, &None, session_privs[2]).unwrap();
        check_added_monitors!(nodes[0], 1);
 
        let mut events = nodes[0].node.get_and_clear_pending_msg_events();
@@ -9988,7 +9158,7 @@ fn test_keysend_payments_to_public_node() {
        let route = find_route(&payer_pubkey, &route_params, &network_graph, None, nodes[0].logger, &scorer, &random_seed_bytes).unwrap();
 
        let test_preimage = PaymentPreimage([42; 32]);
-       let (payment_hash, _) = nodes[0].node.send_spontaneous_payment(&route, Some(test_preimage)).unwrap();
+       let payment_hash = nodes[0].node.send_spontaneous_payment(&route, Some(test_preimage), PaymentId(test_preimage.0)).unwrap();
        check_added_monitors!(nodes[0], 1);
        let mut events = nodes[0].node.get_and_clear_pending_msg_events();
        assert_eq!(events.len(), 1);
@@ -10026,7 +9196,7 @@ fn test_keysend_payments_to_private_node() {
        ).unwrap();
 
        let test_preimage = PaymentPreimage([42; 32]);
-       let (payment_hash, _) = nodes[0].node.send_spontaneous_payment(&route, Some(test_preimage)).unwrap();
+       let payment_hash = nodes[0].node.send_spontaneous_payment(&route, Some(test_preimage), PaymentId(test_preimage.0)).unwrap();
        check_added_monitors!(nodes[0], 1);
        let mut events = nodes[0].node.get_and_clear_pending_msg_events();
        assert_eq!(events.len(), 1);
@@ -10038,9 +9208,9 @@ fn test_keysend_payments_to_private_node() {
 
 #[test]
 fn test_double_partial_claim() {
-       // Test what happens if a node receives a payment, generates a PaymentReceived event, the HTLCs
+       // Test what happens if a node receives a payment, generates a PaymentClaimable event, the HTLCs
        // time out, the sender resends only some of the MPP parts, then the user processes the
-       // PaymentReceived event, ensuring they don't inadvertently claim only part of the full payment
+       // PaymentClaimable event, ensuring they don't inadvertently claim only part of the full payment
        // amount.
        let chanmon_cfgs = create_chanmon_cfgs(4);
        let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
@@ -10061,7 +9231,7 @@ fn test_double_partial_claim() {
        });
 
        send_along_route_with_secret(&nodes[0], route.clone(), &[&[&nodes[1], &nodes[3]], &[&nodes[2], &nodes[3]]], 15_000_000, payment_hash, payment_secret);
-       // nodes[3] has now received a PaymentReceived event...which it will take some (exorbitant)
+       // nodes[3] has now received a PaymentClaimable event...which it will take some (exorbitant)
        // amount of time to respond to.
 
        // Connect some blocks to time out the payment
@@ -10077,7 +9247,7 @@ fn test_double_partial_claim() {
        pass_failed_payment_back(&nodes[0], &[&[&nodes[1], &nodes[3]], &[&nodes[2], &nodes[3]]], false, payment_hash);
 
        // nodes[1] now retries one of the two paths...
-       nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
+       nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret), PaymentId(payment_hash.0)).unwrap();
        check_added_monitors!(nodes[0], 2);
 
        let mut events = nodes[0].node.get_and_clear_pending_msg_events();
@@ -10085,204 +9255,12 @@ fn test_double_partial_claim() {
        pass_along_path(&nodes[0], &[&nodes[1], &nodes[3]], 15_000_000, payment_hash, Some(payment_secret), events.drain(..).next().unwrap(), false, None);
 
        // At this point nodes[3] has received one half of the payment, and the user goes to handle
-       // that PaymentReceived event they got hours ago and never handled...we should refuse to claim.
+       // that PaymentClaimable event they got hours ago and never handled...we should refuse to claim.
        nodes[3].node.claim_funds(payment_preimage);
        check_added_monitors!(nodes[3], 0);
        assert!(nodes[3].node.get_and_clear_pending_msg_events().is_empty());
 }
 
-fn do_test_partial_claim_before_restart(persist_both_monitors: bool) {
-       // Test what happens if a node receives an MPP payment, claims it, but crashes before
-       // persisting the ChannelManager. If `persist_both_monitors` is false, also crash after only
-       // updating one of the two channels' ChannelMonitors. As a result, on startup, we'll (a) still
-       // have the PaymentReceived event, (b) have one (or two) channel(s) that goes on chain with the
-       // HTLC preimage in them, and (c) optionally have one channel that is live off-chain but does
-       // not have the preimage tied to the still-pending HTLC.
-       //
-       // To get to the correct state, on startup we should propagate the preimage to the
-       // still-off-chain channel, claiming the HTLC as soon as the peer connects, with the monitor
-       // receiving the preimage without a state update.
-       //
-       // Further, we should generate a `PaymentClaimed` event to inform the user that the payment was
-       // definitely claimed.
-       let chanmon_cfgs = create_chanmon_cfgs(4);
-       let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
-       let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
-
-       let persister: test_utils::TestPersister;
-       let new_chain_monitor: test_utils::TestChainMonitor;
-       let nodes_3_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
-
-       let mut nodes = create_network(4, &node_cfgs, &node_chanmgrs);
-
-       create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-       create_announced_chan_between_nodes_with_value(&nodes, 0, 2, 100_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-       let chan_id_persisted = create_announced_chan_between_nodes_with_value(&nodes, 1, 3, 100_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features()).2;
-       let chan_id_not_persisted = create_announced_chan_between_nodes_with_value(&nodes, 2, 3, 100_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features()).2;
-
-       // Create an MPP route for 15k sats, more than the default htlc-max of 10%
-       let (mut route, payment_hash, payment_preimage, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[3], 15_000_000);
-       assert_eq!(route.paths.len(), 2);
-       route.paths.sort_by(|path_a, _| {
-               // Sort the path so that the path through nodes[1] comes first
-               if path_a[0].pubkey == nodes[1].node.get_our_node_id() {
-                       core::cmp::Ordering::Less } else { core::cmp::Ordering::Greater }
-       });
-
-       nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
-       check_added_monitors!(nodes[0], 2);
-
-       // Send the payment through to nodes[3] *without* clearing the PaymentReceived event
-       let mut send_events = nodes[0].node.get_and_clear_pending_msg_events();
-       assert_eq!(send_events.len(), 2);
-       do_pass_along_path(&nodes[0], &[&nodes[1], &nodes[3]], 15_000_000, payment_hash, Some(payment_secret), send_events[0].clone(), true, false, None);
-       do_pass_along_path(&nodes[0], &[&nodes[2], &nodes[3]], 15_000_000, payment_hash, Some(payment_secret), send_events[1].clone(), true, false, None);
-
-       // Now that we have an MPP payment pending, get the latest encoded copies of nodes[3]'s
-       // monitors and ChannelManager, for use later, if we don't want to persist both monitors.
-       let mut original_monitor = test_utils::TestVecWriter(Vec::new());
-       if !persist_both_monitors {
-               for outpoint in nodes[3].chain_monitor.chain_monitor.list_monitors() {
-                       if outpoint.to_channel_id() == chan_id_not_persisted {
-                               assert!(original_monitor.0.is_empty());
-                               nodes[3].chain_monitor.chain_monitor.get_monitor(outpoint).unwrap().write(&mut original_monitor).unwrap();
-                       }
-               }
-       }
-
-       let mut original_manager = test_utils::TestVecWriter(Vec::new());
-       nodes[3].node.write(&mut original_manager).unwrap();
-
-       expect_payment_received!(nodes[3], payment_hash, payment_secret, 15_000_000);
-
-       nodes[3].node.claim_funds(payment_preimage);
-       check_added_monitors!(nodes[3], 2);
-       expect_payment_claimed!(nodes[3], payment_hash, 15_000_000);
-
-       // Now fetch one of the two updated ChannelMonitors from nodes[3], and restart pretending we
-       // crashed in between the two persistence calls - using one old ChannelMonitor and one new one,
-       // with the old ChannelManager.
-       let mut updated_monitor = test_utils::TestVecWriter(Vec::new());
-       for outpoint in nodes[3].chain_monitor.chain_monitor.list_monitors() {
-               if outpoint.to_channel_id() == chan_id_persisted {
-                       assert!(updated_monitor.0.is_empty());
-                       nodes[3].chain_monitor.chain_monitor.get_monitor(outpoint).unwrap().write(&mut updated_monitor).unwrap();
-               }
-       }
-       // If `persist_both_monitors` is set, get the second monitor here as well
-       if persist_both_monitors {
-               for outpoint in nodes[3].chain_monitor.chain_monitor.list_monitors() {
-                       if outpoint.to_channel_id() == chan_id_not_persisted {
-                               assert!(original_monitor.0.is_empty());
-                               nodes[3].chain_monitor.chain_monitor.get_monitor(outpoint).unwrap().write(&mut original_monitor).unwrap();
-                       }
-               }
-       }
-
-       // Now restart nodes[3].
-       persister = test_utils::TestPersister::new();
-       let keys_manager = &chanmon_cfgs[3].keys_manager;
-       new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[3].chain_source), nodes[3].tx_broadcaster.clone(), nodes[3].logger, node_cfgs[3].fee_estimator, &persister, keys_manager);
-       nodes[3].chain_monitor = &new_chain_monitor;
-       let mut monitors = Vec::new();
-       for mut monitor_data in [original_monitor, updated_monitor].iter() {
-               let (_, mut deserialized_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(&mut &monitor_data.0[..], keys_manager).unwrap();
-               monitors.push(deserialized_monitor);
-       }
-
-       let config = UserConfig::default();
-       nodes_3_deserialized = {
-               let mut channel_monitors = HashMap::new();
-               for monitor in monitors.iter_mut() {
-                       channel_monitors.insert(monitor.get_funding_txo().0, monitor);
-               }
-               <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut &original_manager.0[..], ChannelManagerReadArgs {
-                       default_config: config,
-                       keys_manager,
-                       fee_estimator: node_cfgs[3].fee_estimator,
-                       chain_monitor: nodes[3].chain_monitor,
-                       tx_broadcaster: nodes[3].tx_broadcaster.clone(),
-                       logger: nodes[3].logger,
-                       channel_monitors,
-               }).unwrap().1
-       };
-       nodes[3].node = &nodes_3_deserialized;
-
-       for monitor in monitors {
-               // On startup the preimage should have been copied into the non-persisted monitor:
-               assert!(monitor.get_stored_preimages().contains_key(&payment_hash));
-               nodes[3].chain_monitor.watch_channel(monitor.get_funding_txo().0.clone(), monitor).unwrap();
-       }
-       check_added_monitors!(nodes[3], 2);
-
-       nodes[1].node.peer_disconnected(&nodes[3].node.get_our_node_id(), false);
-       nodes[2].node.peer_disconnected(&nodes[3].node.get_our_node_id(), false);
-
-       // During deserialization, we should have closed one channel and broadcast its latest
-       // commitment transaction. We should also still have the original PaymentReceived event we
-       // never finished processing.
-       let events = nodes[3].node.get_and_clear_pending_events();
-       assert_eq!(events.len(), if persist_both_monitors { 4 } else { 3 });
-       if let Event::PaymentReceived { amount_msat: 15_000_000, .. } = events[0] { } else { panic!(); }
-       if let Event::ChannelClosed { reason: ClosureReason::OutdatedChannelManager, .. } = events[1] { } else { panic!(); }
-       if persist_both_monitors {
-               if let Event::ChannelClosed { reason: ClosureReason::OutdatedChannelManager, .. } = events[2] { } else { panic!(); }
-       }
-
-       // On restart, we should also get a duplicate PaymentClaimed event as we persisted the
-       // ChannelManager prior to handling the original one.
-       if let Event::PaymentClaimed { payment_hash: our_payment_hash, amount_msat: 15_000_000, .. } =
-               events[if persist_both_monitors { 3 } else { 2 }]
-       {
-               assert_eq!(payment_hash, our_payment_hash);
-       } else { panic!(); }
-
-       assert_eq!(nodes[3].node.list_channels().len(), if persist_both_monitors { 0 } else { 1 });
-       if !persist_both_monitors {
-               // If one of the two channels is still live, reveal the payment preimage over it.
-
-               nodes[3].node.peer_connected(&nodes[2].node.get_our_node_id(), &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-               let reestablish_1 = get_chan_reestablish_msgs!(nodes[3], nodes[2]);
-               nodes[2].node.peer_connected(&nodes[3].node.get_our_node_id(), &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-               let reestablish_2 = get_chan_reestablish_msgs!(nodes[2], nodes[3]);
-
-               nodes[2].node.handle_channel_reestablish(&nodes[3].node.get_our_node_id(), &reestablish_1[0]);
-               get_event_msg!(nodes[2], MessageSendEvent::SendChannelUpdate, nodes[3].node.get_our_node_id());
-               assert!(nodes[2].node.get_and_clear_pending_msg_events().is_empty());
-
-               nodes[3].node.handle_channel_reestablish(&nodes[2].node.get_our_node_id(), &reestablish_2[0]);
-
-               // Once we call `get_and_clear_pending_msg_events` the holding cell is cleared and the HTLC
-               // claim should fly.
-               let ds_msgs = nodes[3].node.get_and_clear_pending_msg_events();
-               check_added_monitors!(nodes[3], 1);
-               assert_eq!(ds_msgs.len(), 2);
-               if let MessageSendEvent::SendChannelUpdate { .. } = ds_msgs[1] {} else { panic!(); }
-
-               let cs_updates = match ds_msgs[0] {
-                       MessageSendEvent::UpdateHTLCs { ref updates, .. } => {
-                               nodes[2].node.handle_update_fulfill_htlc(&nodes[3].node.get_our_node_id(), &updates.update_fulfill_htlcs[0]);
-                               check_added_monitors!(nodes[2], 1);
-                               let cs_updates = get_htlc_update_msgs!(nodes[2], nodes[0].node.get_our_node_id());
-                               expect_payment_forwarded!(nodes[2], nodes[0], nodes[3], Some(1000), false, false);
-                               commitment_signed_dance!(nodes[2], nodes[3], updates.commitment_signed, false, true);
-                               cs_updates
-                       }
-                       _ => panic!(),
-               };
-
-               nodes[0].node.handle_update_fulfill_htlc(&nodes[2].node.get_our_node_id(), &cs_updates.update_fulfill_htlcs[0]);
-               commitment_signed_dance!(nodes[0], nodes[2], cs_updates.commitment_signed, false, true);
-               expect_payment_sent!(nodes[0], payment_preimage);
-       }
-}
-
-#[test]
-fn test_partial_claim_before_restart() {
-       do_test_partial_claim_before_restart(false);
-       do_test_partial_claim_before_restart(true);
-}
-
 /// The possible events which may trigger a `max_dust_htlc_exposure` breach
 #[derive(Clone, Copy, PartialEq)]
 enum ExposureEvent {
@@ -10367,7 +9345,7 @@ fn do_test_max_dust_htlc_exposure(dust_outbound_balance: bool, exposure_breach_e
                        // Note, we need sent payment to be above outbound dust threshold on counterparty_tx of 2132 sats
                        for i in 0..dust_outbound_htlc_on_holder_tx {
                                let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], dust_outbound_htlc_on_holder_tx_msat);
-                               if let Err(_) = nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)) { panic!("Unexpected event at dust HTLC {}", i); }
+                               if let Err(_) = nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret), PaymentId(payment_hash.0)) { panic!("Unexpected event at dust HTLC {}", i); }
                        }
                } else {
                        // Inbound dust threshold: 2324 sats (`dust_buffer_feerate` * HTLC_SUCCESS_TX_WEIGHT / 1000 + holder's `dust_limit_satoshis`)
@@ -10383,7 +9361,7 @@ fn do_test_max_dust_htlc_exposure(dust_outbound_balance: bool, exposure_breach_e
                        // Outbound dust balance: 5000 sats
                        for i in 0..dust_htlc_on_counterparty_tx {
                                let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], dust_htlc_on_counterparty_tx_msat);
-                               if let Err(_) = nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)) { panic!("Unexpected event at dust HTLC {}", i); }
+                               if let Err(_) = nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret), PaymentId(payment_hash.0)) { panic!("Unexpected event at dust HTLC {}", i); }
                        }
                } else {
                        // Inbound dust threshold: 2031 sats (`dust_buffer_feerate` * HTLC_TIMEOUT_TX_WEIGHT / 1000 + counteparty's `dust_limit_satoshis`)
@@ -10402,13 +9380,13 @@ fn do_test_max_dust_htlc_exposure(dust_outbound_balance: bool, exposure_breach_e
                if on_holder_tx {
                        let dust_outbound_overflow = dust_outbound_htlc_on_holder_tx_msat * (dust_outbound_htlc_on_holder_tx + 1);
                        let dust_inbound_overflow = dust_inbound_htlc_on_holder_tx_msat * dust_inbound_htlc_on_holder_tx + dust_outbound_htlc_on_holder_tx_msat;
-                       unwrap_send_err!(nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)), true, APIError::ChannelUnavailable { ref err }, assert_eq!(err, &format!("Cannot send value that would put our exposure to dust HTLCs at {} over the limit {} on holder commitment tx", if dust_outbound_balance { dust_outbound_overflow } else { dust_inbound_overflow }, config.channel_config.max_dust_htlc_exposure_msat)));
+                       unwrap_send_err!(nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret), PaymentId(payment_hash.0)), true, APIError::ChannelUnavailable { ref err }, assert_eq!(err, &format!("Cannot send value that would put our exposure to dust HTLCs at {} over the limit {} on holder commitment tx", if dust_outbound_balance { dust_outbound_overflow } else { dust_inbound_overflow }, config.channel_config.max_dust_htlc_exposure_msat)));
                } else {
-                       unwrap_send_err!(nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)), true, APIError::ChannelUnavailable { ref err }, assert_eq!(err, &format!("Cannot send value that would put our exposure to dust HTLCs at {} over the limit {} on counterparty commitment tx", dust_overflow, config.channel_config.max_dust_htlc_exposure_msat)));
+                       unwrap_send_err!(nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret), PaymentId(payment_hash.0)), true, APIError::ChannelUnavailable { ref err }, assert_eq!(err, &format!("Cannot send value that would put our exposure to dust HTLCs at {} over the limit {} on counterparty commitment tx", dust_overflow, config.channel_config.max_dust_htlc_exposure_msat)));
                }
        } else if exposure_breach_event == ExposureEvent::AtHTLCReception {
                let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], if on_holder_tx { dust_inbound_htlc_on_holder_tx_msat } else { dust_htlc_on_counterparty_tx_msat });
-               nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
+               nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret), PaymentId(payment_hash.0)).unwrap();
                check_added_monitors!(nodes[1], 1);
                let mut events = nodes[1].node.get_and_clear_pending_msg_events();
                assert_eq!(events.len(), 1);
@@ -10426,7 +9404,7 @@ fn do_test_max_dust_htlc_exposure(dust_outbound_balance: bool, exposure_breach_e
                }
        } else if exposure_breach_event == ExposureEvent::AtUpdateFeeOutbound {
                let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 2_500_000);
-               if let Err(_) = nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)) { panic!("Unexpected event at update_fee-swallowed HTLC", ); }
+               if let Err(_) = nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret), PaymentId(payment_hash.0)) { panic!("Unexpected event at update_fee-swallowed HTLC", ); }
                {
                        let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
                        *feerate_lock = *feerate_lock * 10;
@@ -10498,3 +9476,81 @@ fn test_non_final_funding_tx() {
        assert!(nodes[0].node.funding_transaction_generated(&temp_channel_id, &nodes[1].node.get_our_node_id(), tx.clone()).is_ok());
        get_event_msg!(nodes[0], MessageSendEvent::SendFundingCreated, nodes[1].node.get_our_node_id());
 }
+
+#[test]
+fn accept_busted_but_better_fee() {
+       // If a peer sends us a fee update that is too low, but higher than our previous channel
+       // feerate, we should accept it. In the future we may want to consider closing the channel
+       // later, but for now we only accept the update.
+       let mut chanmon_cfgs = create_chanmon_cfgs(2);
+       let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
+       let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
+       let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
+
+       create_chan_between_nodes(&nodes[0], &nodes[1], channelmanager::provided_init_features(), channelmanager::provided_init_features());
+
+       // Set nodes[1] to expect 5,000 sat/kW.
+       {
+               let mut feerate_lock = chanmon_cfgs[1].fee_estimator.sat_per_kw.lock().unwrap();
+               *feerate_lock = 5000;
+       }
+
+       // If nodes[0] increases their feerate, even if its not enough, nodes[1] should accept it.
+       {
+               let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
+               *feerate_lock = 1000;
+       }
+       nodes[0].node.timer_tick_occurred();
+       check_added_monitors!(nodes[0], 1);
+
+       let events = nodes[0].node.get_and_clear_pending_msg_events();
+       assert_eq!(events.len(), 1);
+       match events[0] {
+               MessageSendEvent::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fee, ref commitment_signed, .. }, .. } => {
+                       nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_fee.as_ref().unwrap());
+                       commitment_signed_dance!(nodes[1], nodes[0], commitment_signed, false);
+               },
+               _ => panic!("Unexpected event"),
+       };
+
+       // If nodes[0] increases their feerate further, even if its not enough, nodes[1] should accept
+       // it.
+       {
+               let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
+               *feerate_lock = 2000;
+       }
+       nodes[0].node.timer_tick_occurred();
+       check_added_monitors!(nodes[0], 1);
+
+       let events = nodes[0].node.get_and_clear_pending_msg_events();
+       assert_eq!(events.len(), 1);
+       match events[0] {
+               MessageSendEvent::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fee, ref commitment_signed, .. }, .. } => {
+                       nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_fee.as_ref().unwrap());
+                       commitment_signed_dance!(nodes[1], nodes[0], commitment_signed, false);
+               },
+               _ => panic!("Unexpected event"),
+       };
+
+       // However, if nodes[0] decreases their feerate, nodes[1] should reject it and close the
+       // channel.
+       {
+               let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
+               *feerate_lock = 1000;
+       }
+       nodes[0].node.timer_tick_occurred();
+       check_added_monitors!(nodes[0], 1);
+
+       let events = nodes[0].node.get_and_clear_pending_msg_events();
+       assert_eq!(events.len(), 1);
+       match events[0] {
+               MessageSendEvent::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fee, .. }, .. } => {
+                       nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_fee.as_ref().unwrap());
+                       check_closed_event!(nodes[1], 1, ClosureReason::ProcessingError {
+                               err: "Peer's feerate much too low. Actual: 1000. Our expected lower limit: 5000 (- 250)".to_owned() });
+                       check_closed_broadcast!(nodes[1], true);
+                       check_added_monitors!(nodes[1], 1);
+               },
+               _ => panic!("Unexpected event"),
+       };
+}