Merge pull request #2071 from TheBlueMatt/2023-01-fix-fast-extra-ready-panic
[rust-lightning] / lightning-invoice / src / utils.rs
index d19254c84649e78ddcab64516c6fceaf39e803b9..11a779b1028a8ddceb825cc833cceb57856d52f0 100644 (file)
@@ -1,27 +1,24 @@
 //! Convenient utilities to create an invoice.
 
 use crate::{CreationError, Currency, Invoice, InvoiceBuilder, SignOrCreationError};
-use crate::payment::Payer;
 
 use crate::{prelude::*, Description, InvoiceDescription, Sha256};
 use bech32::ToBase32;
 use bitcoin_hashes::Hash;
 use lightning::chain;
 use lightning::chain::chaininterface::{BroadcasterInterface, FeeEstimator};
-use lightning::chain::keysinterface::{Recipient, KeysInterface};
-use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
-use lightning::ln::channelmanager::{ChannelDetails, ChannelManager, PaymentId, PaymentSendFailure, MIN_FINAL_CLTV_EXPIRY};
-#[cfg(feature = "std")]
+use lightning::chain::keysinterface::{Recipient, NodeSigner, SignerProvider, EntropySource};
+use lightning::ln::{PaymentHash, PaymentSecret};
+use lightning::ln::channelmanager::{ChannelDetails, ChannelManager, MIN_FINAL_CLTV_EXPIRY_DELTA};
 use lightning::ln::channelmanager::{PhantomRouteHints, MIN_CLTV_EXPIRY_DELTA};
 use lightning::ln::inbound_payment::{create, create_from_hash, ExpandedKey};
 use lightning::routing::gossip::RoutingFees;
-use lightning::routing::router::{InFlightHtlcs, Route, RouteHint, RouteHintHop};
+use lightning::routing::router::{RouteHint, RouteHintHop, Router};
 use lightning::util::logger::Logger;
 use secp256k1::PublicKey;
 use core::ops::Deref;
 use core::time::Duration;
 
-#[cfg(feature = "std")]
 /// Utility to create an invoice that can be paid to one of multiple nodes, or a "phantom invoice."
 /// See [`PhantomKeysManager`] for more information on phantom node payments.
 ///
@@ -41,8 +38,15 @@ use core::time::Duration;
 ///
 /// `invoice_expiry_delta_secs` describes the number of seconds that the invoice is valid for
 /// in excess of the current time.
+/// 
+/// `duration_since_epoch` is the current time since epoch in seconds.
 ///
-/// Note that the provided `keys_manager`'s `KeysInterface` implementation must support phantom
+/// You can specify a custom `min_final_cltv_expiry_delta`, or let LDK default it to
+/// [`MIN_FINAL_CLTV_EXPIRY_DELTA`]. The provided expiry must be at least [`MIN_FINAL_CLTV_EXPIRY_DELTA`] - 3.
+/// Note that LDK will add a buffer of 3 blocks to the delta to allow for up to a few new block
+/// confirmations during routing.
+///
+/// Note that the provided `keys_manager`'s `NodeSigner` implementation must support phantom
 /// invoices in its `sign_invoice` implementation ([`PhantomKeysManager`] satisfies this
 /// requirement).
 ///
@@ -51,24 +55,28 @@ use core::time::Duration;
 /// [`ChannelManager::create_inbound_payment`]: lightning::ln::channelmanager::ChannelManager::create_inbound_payment
 /// [`ChannelManager::create_inbound_payment_for_hash`]: lightning::ln::channelmanager::ChannelManager::create_inbound_payment_for_hash
 /// [`PhantomRouteHints::channels`]: lightning::ln::channelmanager::PhantomRouteHints::channels
-pub fn create_phantom_invoice<K: Deref, L: Deref>(
+/// [`MIN_FINAL_CLTV_EXPIRY_DETLA`]: lightning::ln::channelmanager::MIN_FINAL_CLTV_EXPIRY_DELTA
+/// 
+/// This can be used in a `no_std` environment, where [`std::time::SystemTime`] is not
+/// available and the current time is supplied by the caller.
+pub fn create_phantom_invoice<ES: Deref, NS: Deref, L: Deref>(
        amt_msat: Option<u64>, payment_hash: Option<PaymentHash>, description: String,
-       invoice_expiry_delta_secs: u32, phantom_route_hints: Vec<PhantomRouteHints>, keys_manager: K,
-       logger: L, network: Currency,
+       invoice_expiry_delta_secs: u32, phantom_route_hints: Vec<PhantomRouteHints>, entropy_source: ES,
+       node_signer: NS, logger: L, network: Currency, min_final_cltv_expiry_delta: Option<u16>, duration_since_epoch: Duration,
 ) -> Result<Invoice, SignOrCreationError<()>>
 where
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
        L::Target: Logger,
 {
        let description = Description::new(description).map_err(SignOrCreationError::CreationError)?;
        let description = InvoiceDescription::Direct(&description,);
-       _create_phantom_invoice::<K, L>(
+       _create_phantom_invoice::<ES, NS, L>(
                amt_msat, payment_hash, description, invoice_expiry_delta_secs, phantom_route_hints,
-               keys_manager, logger, network,
+               entropy_source, node_signer, logger, network, min_final_cltv_expiry_delta, duration_since_epoch,
        )
 }
 
-#[cfg(feature = "std")]
 /// Utility to create an invoice that can be paid to one of multiple nodes, or a "phantom invoice."
 /// See [`PhantomKeysManager`] for more information on phantom node payments.
 ///
@@ -90,8 +98,10 @@ where
 ///
 /// `invoice_expiry_delta_secs` describes the number of seconds that the invoice is valid for
 /// in excess of the current time.
+/// 
+/// `duration_since_epoch` is the current time since epoch in seconds.
 ///
-/// Note that the provided `keys_manager`'s `KeysInterface` implementation must support phantom
+/// Note that the provided `keys_manager`'s `NodeSigner` implementation must support phantom
 /// invoices in its `sign_invoice` implementation ([`PhantomKeysManager`] satisfies this
 /// requirement).
 ///
@@ -100,32 +110,36 @@ where
 /// [`ChannelManager::create_inbound_payment`]: lightning::ln::channelmanager::ChannelManager::create_inbound_payment
 /// [`ChannelManager::create_inbound_payment_for_hash`]: lightning::ln::channelmanager::ChannelManager::create_inbound_payment_for_hash
 /// [`PhantomRouteHints::channels`]: lightning::ln::channelmanager::PhantomRouteHints::channels
-pub fn create_phantom_invoice_with_description_hash<K: Deref, L: Deref>(
+/// 
+/// This can be used in a `no_std` environment, where [`std::time::SystemTime`] is not
+/// available and the current time is supplied by the caller.
+pub fn create_phantom_invoice_with_description_hash<ES: Deref, NS: Deref, L: Deref>(
        amt_msat: Option<u64>, payment_hash: Option<PaymentHash>, invoice_expiry_delta_secs: u32,
-       description_hash: Sha256, phantom_route_hints: Vec<PhantomRouteHints>, keys_manager: K,
-       logger: L, network: Currency
+       description_hash: Sha256, phantom_route_hints: Vec<PhantomRouteHints>, entropy_source: ES,
+       node_signer: NS, logger: L, network: Currency, min_final_cltv_expiry_delta: Option<u16>, duration_since_epoch: Duration,
 ) -> Result<Invoice, SignOrCreationError<()>>
 where
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
        L::Target: Logger,
 {
-       _create_phantom_invoice::<K, L>(
+       _create_phantom_invoice::<ES, NS, L>(
                amt_msat, payment_hash, InvoiceDescription::Hash(&description_hash),
-               invoice_expiry_delta_secs, phantom_route_hints, keys_manager, logger, network,
+               invoice_expiry_delta_secs, phantom_route_hints, entropy_source, node_signer, logger, network,
+               min_final_cltv_expiry_delta, duration_since_epoch,
        )
 }
 
-#[cfg(feature = "std")]
-fn _create_phantom_invoice<K: Deref, L: Deref>(
+fn _create_phantom_invoice<ES: Deref, NS: Deref, L: Deref>(
        amt_msat: Option<u64>, payment_hash: Option<PaymentHash>, description: InvoiceDescription,
-       invoice_expiry_delta_secs: u32, phantom_route_hints: Vec<PhantomRouteHints>, keys_manager: K,
-       logger: L, network: Currency,
+       invoice_expiry_delta_secs: u32, phantom_route_hints: Vec<PhantomRouteHints>, entropy_source: ES,
+       node_signer: NS, logger: L, network: Currency, min_final_cltv_expiry_delta: Option<u16>, duration_since_epoch: Duration,
 ) -> Result<Invoice, SignOrCreationError<()>>
 where
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
        L::Target: Logger,
 {
-       use std::time::{SystemTime, UNIX_EPOCH};
 
        if phantom_route_hints.len() == 0 {
                return Err(SignOrCreationError::CreationError(
@@ -133,6 +147,10 @@ where
                ));
        }
 
+       if min_final_cltv_expiry_delta.is_some() && min_final_cltv_expiry_delta.unwrap().saturating_add(3) < MIN_FINAL_CLTV_EXPIRY_DELTA {
+               return Err(SignOrCreationError::CreationError(CreationError::MinFinalCltvExpiryDeltaTooShort));
+       }
+
        let invoice = match description {
                InvoiceDescription::Direct(description) => {
                        InvoiceBuilder::new(network).description(description.0.clone())
@@ -141,17 +159,16 @@ where
        };
 
        // If we ever see performance here being too slow then we should probably take this ExpandedKey as a parameter instead.
-       let keys = ExpandedKey::new(&keys_manager.get_inbound_payment_key_material());
+       let keys = ExpandedKey::new(&node_signer.get_inbound_payment_key_material());
        let (payment_hash, payment_secret) = if let Some(payment_hash) = payment_hash {
                let payment_secret = create_from_hash(
                        &keys,
                        amt_msat,
                        payment_hash,
                        invoice_expiry_delta_secs,
-                       SystemTime::now()
-                               .duration_since(UNIX_EPOCH)
-                               .expect("Time must be > 1970")
+                       duration_since_epoch
                                .as_secs(),
+                       min_final_cltv_expiry_delta,
                )
                .map_err(|_| SignOrCreationError::CreationError(CreationError::InvalidAmount))?;
                (payment_hash, payment_secret)
@@ -160,11 +177,10 @@ where
                        &keys,
                        amt_msat,
                        invoice_expiry_delta_secs,
-                       &keys_manager,
-                       SystemTime::now()
-                               .duration_since(UNIX_EPOCH)
-                               .expect("Time must be > 1970")
+                       &entropy_source,
+                       duration_since_epoch
                                .as_secs(),
+                       min_final_cltv_expiry_delta,
                )
                .map_err(|_| SignOrCreationError::CreationError(CreationError::InvalidAmount))?
        };
@@ -173,10 +189,12 @@ where
                phantom_route_hints.len(), log_bytes!(payment_hash.0));
 
        let mut invoice = invoice
-               .current_timestamp()
+               .duration_since_epoch(duration_since_epoch)
                .payment_hash(Hash::from_slice(&payment_hash.0).unwrap())
                .payment_secret(payment_secret)
-               .min_final_cltv_expiry(MIN_FINAL_CLTV_EXPIRY.into())
+               .min_final_cltv_expiry_delta(
+                       // Add a buffer of 3 to the delta if present, otherwise use LDK's minimum.
+                       min_final_cltv_expiry_delta.map(|x| x.saturating_add(3)).unwrap_or(MIN_FINAL_CLTV_EXPIRY_DELTA).into())
                .expiry_time(Duration::from_secs(invoice_expiry_delta_secs.into()));
        if let Some(amt) = amt_msat {
                invoice = invoice.amount_milli_satoshis(amt);
@@ -216,7 +234,7 @@ where
        let hrp_str = raw_invoice.hrp.to_string();
        let hrp_bytes = hrp_str.as_bytes();
        let data_without_signature = raw_invoice.data.to_base32();
-       let signed_raw_invoice = raw_invoice.sign(|_| keys_manager.sign_invoice(hrp_bytes, &data_without_signature, Recipient::PhantomNode));
+       let signed_raw_invoice = raw_invoice.sign(|_| node_signer.sign_invoice(hrp_bytes, &data_without_signature, Recipient::PhantomNode));
        match signed_raw_invoice {
                Ok(inv) => Ok(Invoice::from_signed(inv).unwrap()),
                Err(e) => Err(SignOrCreationError::SignError(e))
@@ -232,23 +250,34 @@ where
 ///
 /// `invoice_expiry_delta_secs` describes the number of seconds that the invoice is valid for
 /// in excess of the current time.
-pub fn create_invoice_from_channelmanager<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
-       channelmanager: &ChannelManager<M, T, K, F, L>, keys_manager: K, logger: L,
-       network: Currency, amt_msat: Option<u64>, description: String, invoice_expiry_delta_secs: u32
+///
+/// You can specify a custom `min_final_cltv_expiry_delta`, or let LDK default it to
+/// [`MIN_FINAL_CLTV_EXPIRY_DELTA`]. The provided expiry must be at least [`MIN_FINAL_CLTV_EXPIRY_DELTA`].
+/// Note that LDK will add a buffer of 3 blocks to the delta to allow for up to a few new block
+/// confirmations during routing.
+///
+/// [`MIN_FINAL_CLTV_EXPIRY_DETLA`]: lightning::ln::channelmanager::MIN_FINAL_CLTV_EXPIRY_DELTA
+pub fn create_invoice_from_channelmanager<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref>(
+       channelmanager: &ChannelManager<M, T, ES, NS, SP, F, R, L>, node_signer: NS, logger: L,
+       network: Currency, amt_msat: Option<u64>, description: String, invoice_expiry_delta_secs: u32,
+       min_final_cltv_expiry_delta: Option<u16>,
 ) -> Result<Invoice, SignOrCreationError<()>>
 where
-       M::Target: chain::Watch<<K::Target as KeysInterface>::Signer>,
+       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
+       SP::Target: SignerProvider,
        F::Target: FeeEstimator,
+       R::Target: Router,
        L::Target: Logger,
 {
        use std::time::SystemTime;
        let duration = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)
                .expect("for the foreseeable future this shouldn't happen");
        create_invoice_from_channelmanager_and_duration_since_epoch(
-               channelmanager, keys_manager, logger, network, amt_msat, description, duration,
-               invoice_expiry_delta_secs
+               channelmanager, node_signer, logger, network, amt_msat,
+               description, duration, invoice_expiry_delta_secs, min_final_cltv_expiry_delta,
        )
 }
 
@@ -262,16 +291,26 @@ where
 ///
 /// `invoice_expiry_delta_secs` describes the number of seconds that the invoice is valid for
 /// in excess of the current time.
-pub fn create_invoice_from_channelmanager_with_description_hash<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
-       channelmanager: &ChannelManager<M, T, K, F, L>, keys_manager: K, logger: L,
+///
+/// You can specify a custom `min_final_cltv_expiry_delta`, or let LDK default it to
+/// [`MIN_FINAL_CLTV_EXPIRY_DELTA`]. The provided expiry must be at least [`MIN_FINAL_CLTV_EXPIRY_DELTA`].
+/// Note that LDK will add a buffer of 3 blocks to the delta to allow for up to a few new block
+/// confirmations during routing.
+///
+/// [`MIN_FINAL_CLTV_EXPIRY_DETLA`]: lightning::ln::channelmanager::MIN_FINAL_CLTV_EXPIRY_DELTA
+pub fn create_invoice_from_channelmanager_with_description_hash<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref>(
+       channelmanager: &ChannelManager<M, T, ES, NS, SP, F, R, L>, node_signer: NS, logger: L,
        network: Currency, amt_msat: Option<u64>, description_hash: Sha256,
-       invoice_expiry_delta_secs: u32
+       invoice_expiry_delta_secs: u32, min_final_cltv_expiry_delta: Option<u16>,
 ) -> Result<Invoice, SignOrCreationError<()>>
 where
-       M::Target: chain::Watch<<K::Target as KeysInterface>::Signer>,
+       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
+       SP::Target: SignerProvider,
        F::Target: FeeEstimator,
+       R::Target: Router,
        L::Target: Logger,
 {
        use std::time::SystemTime;
@@ -281,77 +320,148 @@ where
                .expect("for the foreseeable future this shouldn't happen");
 
        create_invoice_from_channelmanager_with_description_hash_and_duration_since_epoch(
-               channelmanager, keys_manager, logger, network, amt_msat,
-               description_hash, duration, invoice_expiry_delta_secs
+               channelmanager, node_signer, logger, network, amt_msat,
+               description_hash, duration, invoice_expiry_delta_secs, min_final_cltv_expiry_delta,
        )
 }
 
 /// See [`create_invoice_from_channelmanager_with_description_hash`]
 /// This version can be used in a `no_std` environment, where [`std::time::SystemTime`] is not
 /// available and the current time is supplied by the caller.
-pub fn create_invoice_from_channelmanager_with_description_hash_and_duration_since_epoch<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
-       channelmanager: &ChannelManager<M, T, K, F, L>, keys_manager: K, logger: L,
+pub fn create_invoice_from_channelmanager_with_description_hash_and_duration_since_epoch<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref>(
+       channelmanager: &ChannelManager<M, T, ES, NS, SP, F, R, L>, node_signer: NS, logger: L,
        network: Currency, amt_msat: Option<u64>, description_hash: Sha256,
-       duration_since_epoch: Duration, invoice_expiry_delta_secs: u32
+       duration_since_epoch: Duration, invoice_expiry_delta_secs: u32, min_final_cltv_expiry_delta: Option<u16>,
 ) -> Result<Invoice, SignOrCreationError<()>>
-where
-       M::Target: chain::Watch<<K::Target as KeysInterface>::Signer>,
-       T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
-       F::Target: FeeEstimator,
-       L::Target: Logger,
+               where
+                       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
+                       T::Target: BroadcasterInterface,
+                       ES::Target: EntropySource,
+                       NS::Target: NodeSigner,
+                       SP::Target: SignerProvider,
+                       F::Target: FeeEstimator,
+                       R::Target: Router,
+                       L::Target: Logger,
 {
        _create_invoice_from_channelmanager_and_duration_since_epoch(
-               channelmanager, keys_manager, logger, network, amt_msat,
+               channelmanager, node_signer, logger, network, amt_msat,
                InvoiceDescription::Hash(&description_hash),
-               duration_since_epoch, invoice_expiry_delta_secs
+               duration_since_epoch, invoice_expiry_delta_secs, min_final_cltv_expiry_delta,
        )
 }
 
 /// See [`create_invoice_from_channelmanager`]
 /// This version can be used in a `no_std` environment, where [`std::time::SystemTime`] is not
 /// available and the current time is supplied by the caller.
-pub fn create_invoice_from_channelmanager_and_duration_since_epoch<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
-       channelmanager: &ChannelManager<M, T, K, F, L>, keys_manager: K, logger: L,
+pub fn create_invoice_from_channelmanager_and_duration_since_epoch<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref>(
+       channelmanager: &ChannelManager<M, T, ES, NS, SP, F, R, L>, node_signer: NS, logger: L,
        network: Currency, amt_msat: Option<u64>, description: String, duration_since_epoch: Duration,
-       invoice_expiry_delta_secs: u32
+       invoice_expiry_delta_secs: u32, min_final_cltv_expiry_delta: Option<u16>,
 ) -> Result<Invoice, SignOrCreationError<()>>
-where
-       M::Target: chain::Watch<<K::Target as KeysInterface>::Signer>,
-       T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
-       F::Target: FeeEstimator,
-       L::Target: Logger,
+               where
+                       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
+                       T::Target: BroadcasterInterface,
+                       ES::Target: EntropySource,
+                       NS::Target: NodeSigner,
+                       SP::Target: SignerProvider,
+                       F::Target: FeeEstimator,
+                       R::Target: Router,
+                       L::Target: Logger,
 {
        _create_invoice_from_channelmanager_and_duration_since_epoch(
-               channelmanager, keys_manager, logger, network, amt_msat,
+               channelmanager, node_signer, logger, network, amt_msat,
                InvoiceDescription::Direct(
                        &Description::new(description).map_err(SignOrCreationError::CreationError)?,
                ),
-               duration_since_epoch, invoice_expiry_delta_secs
+               duration_since_epoch, invoice_expiry_delta_secs, min_final_cltv_expiry_delta,
        )
 }
 
-fn _create_invoice_from_channelmanager_and_duration_since_epoch<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
-       channelmanager: &ChannelManager<M, T, K, F, L>, keys_manager: K, logger: L,
+fn _create_invoice_from_channelmanager_and_duration_since_epoch<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref>(
+       channelmanager: &ChannelManager<M, T, ES, NS, SP, F, R, L>, node_signer: NS, logger: L,
        network: Currency, amt_msat: Option<u64>, description: InvoiceDescription,
-       duration_since_epoch: Duration, invoice_expiry_delta_secs: u32
+       duration_since_epoch: Duration, invoice_expiry_delta_secs: u32, min_final_cltv_expiry_delta: Option<u16>,
 ) -> Result<Invoice, SignOrCreationError<()>>
-where
-       M::Target: chain::Watch<<K::Target as KeysInterface>::Signer>,
-       T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
-       F::Target: FeeEstimator,
-       L::Target: Logger,
+               where
+                       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
+                       T::Target: BroadcasterInterface,
+                       ES::Target: EntropySource,
+                       NS::Target: NodeSigner,
+                       SP::Target: SignerProvider,
+                       F::Target: FeeEstimator,
+                       R::Target: Router,
+                       L::Target: Logger,
 {
+       if min_final_cltv_expiry_delta.is_some() && min_final_cltv_expiry_delta.unwrap().saturating_add(3) < MIN_FINAL_CLTV_EXPIRY_DELTA {
+               return Err(SignOrCreationError::CreationError(CreationError::MinFinalCltvExpiryDeltaTooShort));
+       }
+
        // `create_inbound_payment` only returns an error if the amount is greater than the total bitcoin
        // supply.
        let (payment_hash, payment_secret) = channelmanager
-               .create_inbound_payment(amt_msat, invoice_expiry_delta_secs)
+               .create_inbound_payment(amt_msat, invoice_expiry_delta_secs, min_final_cltv_expiry_delta)
                .map_err(|()| SignOrCreationError::CreationError(CreationError::InvalidAmount))?;
+       _create_invoice_from_channelmanager_and_duration_since_epoch_with_payment_hash(
+               channelmanager, node_signer, logger, network, amt_msat, description, duration_since_epoch,
+               invoice_expiry_delta_secs, payment_hash, payment_secret, min_final_cltv_expiry_delta)
+}
+
+/// See [`create_invoice_from_channelmanager_and_duration_since_epoch`]
+/// This version allows for providing a custom [`PaymentHash`] for the invoice.
+/// This may be useful if you're building an on-chain swap or involving another protocol where
+/// the payment hash is also involved outside the scope of lightning.
+pub fn create_invoice_from_channelmanager_and_duration_since_epoch_with_payment_hash<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref>(
+       channelmanager: &ChannelManager<M, T, ES, NS, SP, F, R, L>, node_signer: NS, logger: L,
+       network: Currency, amt_msat: Option<u64>, description: String, duration_since_epoch: Duration,
+       invoice_expiry_delta_secs: u32, payment_hash: PaymentHash, min_final_cltv_expiry_delta: Option<u16>,
+) -> Result<Invoice, SignOrCreationError<()>>
+       where
+               M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
+               T::Target: BroadcasterInterface,
+               ES::Target: EntropySource,
+               NS::Target: NodeSigner,
+               SP::Target: SignerProvider,
+               F::Target: FeeEstimator,
+               R::Target: Router,
+               L::Target: Logger,
+{
+       let payment_secret = channelmanager
+               .create_inbound_payment_for_hash(payment_hash, amt_msat, invoice_expiry_delta_secs,
+                       min_final_cltv_expiry_delta)
+               .map_err(|()| SignOrCreationError::CreationError(CreationError::InvalidAmount))?;
+       _create_invoice_from_channelmanager_and_duration_since_epoch_with_payment_hash(
+               channelmanager, node_signer, logger, network, amt_msat,
+               InvoiceDescription::Direct(
+                       &Description::new(description).map_err(SignOrCreationError::CreationError)?,
+               ),
+               duration_since_epoch, invoice_expiry_delta_secs, payment_hash, payment_secret,
+               min_final_cltv_expiry_delta,
+       )
+}
+
+fn _create_invoice_from_channelmanager_and_duration_since_epoch_with_payment_hash<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref>(
+       channelmanager: &ChannelManager<M, T, ES, NS, SP, F, R, L>, node_signer: NS, logger: L,
+       network: Currency, amt_msat: Option<u64>, description: InvoiceDescription, duration_since_epoch: Duration,
+       invoice_expiry_delta_secs: u32, payment_hash: PaymentHash, payment_secret: PaymentSecret,
+       min_final_cltv_expiry_delta: Option<u16>,
+) -> Result<Invoice, SignOrCreationError<()>>
+       where
+               M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
+               T::Target: BroadcasterInterface,
+               ES::Target: EntropySource,
+               NS::Target: NodeSigner,
+               SP::Target: SignerProvider,
+               F::Target: FeeEstimator,
+               R::Target: Router,
+               L::Target: Logger,
+{
        let our_node_pubkey = channelmanager.get_our_node_id();
        let channels = channelmanager.list_channels();
 
+       if min_final_cltv_expiry_delta.is_some() && min_final_cltv_expiry_delta.unwrap().saturating_add(3) < MIN_FINAL_CLTV_EXPIRY_DELTA {
+               return Err(SignOrCreationError::CreationError(CreationError::MinFinalCltvExpiryDeltaTooShort));
+       }
+
        log_trace!(logger, "Creating invoice with payment hash {}", log_bytes!(payment_hash.0));
 
        let invoice = match description {
@@ -367,7 +477,9 @@ where
                .payment_hash(Hash::from_slice(&payment_hash.0).unwrap())
                .payment_secret(payment_secret)
                .basic_mpp()
-               .min_final_cltv_expiry(MIN_FINAL_CLTV_EXPIRY.into())
+               .min_final_cltv_expiry_delta(
+                       // Add a buffer of 3 to the delta if present, otherwise use LDK's minimum.
+                       min_final_cltv_expiry_delta.map(|x| x.saturating_add(3)).unwrap_or(MIN_FINAL_CLTV_EXPIRY_DELTA).into())
                .expiry_time(Duration::from_secs(invoice_expiry_delta_secs.into()));
        if let Some(amt) = amt_msat {
                invoice = invoice.amount_milli_satoshis(amt);
@@ -385,7 +497,7 @@ where
        let hrp_str = raw_invoice.hrp.to_string();
        let hrp_bytes = hrp_str.as_bytes();
        let data_without_signature = raw_invoice.data.to_base32();
-       let signed_raw_invoice = raw_invoice.sign(|_| keys_manager.sign_invoice(hrp_bytes, &data_without_signature, Recipient::Node));
+       let signed_raw_invoice = raw_invoice.sign(|_| node_signer.sign_invoice(hrp_bytes, &data_without_signature, Recipient::Node));
        match signed_raw_invoice {
                Ok(inv) => Ok(Invoice::from_signed(inv).unwrap()),
                Err(e) => Err(SignOrCreationError::SignError(e))
@@ -521,64 +633,21 @@ fn filter_channels<L: Deref>(
                .collect::<Vec<RouteHint>>()
 }
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> Payer for ChannelManager<M, T, K, F, L>
-where
-       M::Target: chain::Watch<<K::Target as KeysInterface>::Signer>,
-       T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
-       F::Target: FeeEstimator,
-       L::Target: Logger,
-{
-       fn node_id(&self) -> PublicKey {
-               self.get_our_node_id()
-       }
-
-       fn first_hops(&self) -> Vec<ChannelDetails> {
-               self.list_usable_channels()
-       }
-
-       fn send_payment(
-               &self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>,
-               payment_id: PaymentId
-       ) -> Result<(), PaymentSendFailure> {
-               self.send_payment(route, payment_hash, payment_secret, payment_id)
-       }
-
-       fn send_spontaneous_payment(
-               &self, route: &Route, payment_preimage: PaymentPreimage, payment_id: PaymentId,
-       ) -> Result<(), PaymentSendFailure> {
-               self.send_spontaneous_payment(route, Some(payment_preimage), payment_id).map(|_| ())
-       }
-
-       fn retry_payment(
-               &self, route: &Route, payment_id: PaymentId
-       ) -> Result<(), PaymentSendFailure> {
-               self.retry_payment(route, payment_id)
-       }
-
-       fn abandon_payment(&self, payment_id: PaymentId) {
-               self.abandon_payment(payment_id)
-       }
-
-       fn inflight_htlcs(&self) -> InFlightHtlcs { self.compute_inflight_htlcs() }
-}
-
 #[cfg(test)]
 mod test {
        use core::time::Duration;
-       use crate::{Currency, Description, InvoiceDescription};
-       use bitcoin_hashes::Hash;
+       use crate::{Currency, Description, InvoiceDescription, SignOrCreationError, CreationError};
+       use bitcoin_hashes::{Hash, sha256};
        use bitcoin_hashes::sha256::Hash as Sha256;
-       use lightning::chain::keysinterface::PhantomKeysManager;
+       use lightning::chain::keysinterface::{EntropySource, PhantomKeysManager};
        use lightning::ln::{PaymentPreimage, PaymentHash};
-       use lightning::ln::channelmanager::{self, PhantomRouteHints, MIN_FINAL_CLTV_EXPIRY, PaymentId};
+       use lightning::ln::channelmanager::{PhantomRouteHints, MIN_FINAL_CLTV_EXPIRY_DELTA, PaymentId};
        use lightning::ln::functional_test_utils::*;
        use lightning::ln::msgs::ChannelMessageHandler;
        use lightning::routing::router::{PaymentParameters, RouteParameters, find_route};
        use lightning::util::events::{MessageSendEvent, MessageSendEventsProvider, Event};
        use lightning::util::test_utils;
        use lightning::util::config::UserConfig;
-       use lightning::chain::keysinterface::KeysInterface;
        use crate::utils::create_invoice_from_channelmanager_and_duration_since_epoch;
        use std::collections::HashSet;
 
@@ -588,14 +657,15 @@ mod test {
                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_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001);
                let non_default_invoice_expiry_secs = 4200;
                let invoice = create_invoice_from_channelmanager_and_duration_since_epoch(
                        &nodes[1].node, nodes[1].keys_manager, nodes[1].logger, Currency::BitcoinTestnet,
                        Some(10_000), "test".to_string(), Duration::from_secs(1234567),
-                       non_default_invoice_expiry_secs).unwrap();
+                       non_default_invoice_expiry_secs, None).unwrap();
                assert_eq!(invoice.amount_pico_btc(), Some(100_000));
-               assert_eq!(invoice.min_final_cltv_expiry(), MIN_FINAL_CLTV_EXPIRY as u64);
+               // If no `min_final_cltv_expiry_delta` is specified, then it should be `MIN_FINAL_CLTV_EXPIRY_DELTA`.
+               assert_eq!(invoice.min_final_cltv_expiry_delta(), MIN_FINAL_CLTV_EXPIRY_DELTA as u64);
                assert_eq!(invoice.description(), InvoiceDescription::Direct(&Description("test".to_string())));
                assert_eq!(invoice.expiry_time(), Duration::from_secs(non_default_invoice_expiry_secs.into()));
 
@@ -609,18 +679,18 @@ mod test {
                assert_eq!(invoice.route_hints()[0].0[0].htlc_minimum_msat, chan.inbound_htlc_minimum_msat);
                assert_eq!(invoice.route_hints()[0].0[0].htlc_maximum_msat, chan.inbound_htlc_maximum_msat);
 
-               let payment_params = PaymentParameters::from_node_id(invoice.recover_payee_pub_key())
+               let payment_params = PaymentParameters::from_node_id(invoice.recover_payee_pub_key(),
+                               invoice.min_final_cltv_expiry_delta() as u32)
                        .with_features(invoice.features().unwrap().clone())
                        .with_route_hints(invoice.route_hints());
                let route_params = RouteParameters {
                        payment_params,
                        final_value_msat: invoice.amount_milli_satoshis().unwrap(),
-                       final_cltv_expiry_delta: invoice.min_final_cltv_expiry() as u32,
                };
                let first_hops = nodes[0].node.list_usable_channels();
                let network_graph = &node_cfgs[0].network_graph;
                let logger = test_utils::TestLogger::new();
-               let scorer = test_utils::TestScorer::with_penalty(0);
+               let scorer = test_utils::TestScorer::new();
                let random_seed_bytes = chanmon_cfgs[1].keys_manager.get_secure_random_bytes();
                let route = find_route(
                        &nodes[0].node.get_our_node_id(), &route_params, &network_graph,
@@ -649,6 +719,44 @@ mod test {
                assert_eq!(events.len(), 2);
        }
 
+       fn do_create_invoice_min_final_cltv_delta(with_custom_delta: bool) {
+               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 nodes = create_network(2, &node_cfgs, &node_chanmgrs);
+               let custom_min_final_cltv_expiry_delta = Some(50);
+
+               let invoice = crate::utils::create_invoice_from_channelmanager_and_duration_since_epoch(
+                       &nodes[1].node, nodes[1].keys_manager, nodes[1].logger, Currency::BitcoinTestnet,
+                       Some(10_000), "".into(), Duration::from_secs(1234567), 3600,
+                       if with_custom_delta { custom_min_final_cltv_expiry_delta } else { None },
+               ).unwrap();
+               assert_eq!(invoice.min_final_cltv_expiry_delta(), if with_custom_delta {
+                       custom_min_final_cltv_expiry_delta.unwrap() + 3 /* Buffer */} else { MIN_FINAL_CLTV_EXPIRY_DELTA } as u64);
+       }
+
+       #[test]
+       fn test_create_invoice_custom_min_final_cltv_delta() {
+               do_create_invoice_min_final_cltv_delta(true);
+               do_create_invoice_min_final_cltv_delta(false);
+       }
+
+       #[test]
+       fn create_invoice_min_final_cltv_delta_equals_htlc_fail_buffer() {
+               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 nodes = create_network(2, &node_cfgs, &node_chanmgrs);
+               let custom_min_final_cltv_expiry_delta = Some(21);
+
+               let invoice = crate::utils::create_invoice_from_channelmanager_and_duration_since_epoch(
+                       &nodes[1].node, nodes[1].keys_manager, nodes[1].logger, Currency::BitcoinTestnet,
+                       Some(10_000), "".into(), Duration::from_secs(1234567), 3600,
+                       custom_min_final_cltv_expiry_delta,
+               ).unwrap();
+               assert_eq!(invoice.min_final_cltv_expiry_delta(), MIN_FINAL_CLTV_EXPIRY_DELTA as u64);
+       }
+
        #[test]
        fn test_create_invoice_with_description_hash() {
                let chanmon_cfgs = create_chanmon_cfgs(2);
@@ -658,13 +766,31 @@ mod test {
                let description_hash = crate::Sha256(Hash::hash("Testing description_hash".as_bytes()));
                let invoice = crate::utils::create_invoice_from_channelmanager_with_description_hash_and_duration_since_epoch(
                        &nodes[1].node, nodes[1].keys_manager, nodes[1].logger, Currency::BitcoinTestnet,
-                       Some(10_000), description_hash, Duration::from_secs(1234567), 3600
+                       Some(10_000), description_hash, Duration::from_secs(1234567), 3600, None,
                ).unwrap();
                assert_eq!(invoice.amount_pico_btc(), Some(100_000));
-               assert_eq!(invoice.min_final_cltv_expiry(), MIN_FINAL_CLTV_EXPIRY as u64);
+               assert_eq!(invoice.min_final_cltv_expiry_delta(), MIN_FINAL_CLTV_EXPIRY_DELTA as u64);
                assert_eq!(invoice.description(), InvoiceDescription::Hash(&crate::Sha256(Sha256::hash("Testing description_hash".as_bytes()))));
        }
 
+       #[test]
+       fn test_create_invoice_from_channelmanager_and_duration_since_epoch_with_payment_hash() {
+               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 nodes = create_network(2, &node_cfgs, &node_chanmgrs);
+               let payment_hash = PaymentHash([0; 32]);
+               let invoice = crate::utils::create_invoice_from_channelmanager_and_duration_since_epoch_with_payment_hash(
+                       &nodes[1].node, nodes[1].keys_manager, nodes[1].logger, Currency::BitcoinTestnet,
+                       Some(10_000), "test".to_string(), Duration::from_secs(1234567), 3600,
+                       payment_hash, None,
+               ).unwrap();
+               assert_eq!(invoice.amount_pico_btc(), Some(100_000));
+               assert_eq!(invoice.min_final_cltv_expiry_delta(), MIN_FINAL_CLTV_EXPIRY_DELTA as u64);
+               assert_eq!(invoice.description(), InvoiceDescription::Direct(&Description("test".to_string())));
+               assert_eq!(invoice.payment_hash(), &sha256::Hash::from_slice(&payment_hash.0[..]).unwrap());
+       }
+
        #[test]
        fn test_hints_includes_single_channels_to_nodes() {
                let chanmon_cfgs = create_chanmon_cfgs(3);
@@ -672,8 +798,8 @@ mod test {
                let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
                let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 
-               let chan_1_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               let chan_2_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 2, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_1_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 100000, 10001);
+               let chan_2_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 2, 0, 100000, 10001);
 
                let mut scid_aliases = HashSet::new();
                scid_aliases.insert(chan_1_0.0.short_channel_id_alias.unwrap());
@@ -688,13 +814,11 @@ mod test {
                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);
-               let _chan_1_0_low_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 100_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               let chan_1_0_high_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 10_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               let _chan_1_0_medium_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 1_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-
+               let _chan_1_0_low_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 100_000, 0);
+               let chan_1_0_high_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 10_000_000, 0);
+               let _chan_1_0_medium_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 1_000_000, 0);
                let mut scid_aliases = HashSet::new();
                scid_aliases.insert(chan_1_0_high_inbound_capacity.0.short_channel_id_alias.unwrap());
-
                match_invoice_routes(Some(5000), &nodes[0], scid_aliases);
        }
 
@@ -704,9 +828,9 @@ mod test {
                let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
                let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
                let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
-               let chan_a = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 10_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               let chan_b = create_unannounced_chan_between_nodes_with_value(&nodes, 2, 0, 10_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               let _chan_c = create_unannounced_chan_between_nodes_with_value(&nodes, 3, 0, 1_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_a = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 10_000_000, 0);
+               let chan_b = create_unannounced_chan_between_nodes_with_value(&nodes, 2, 0, 10_000_000, 0);
+               let _chan_c = create_unannounced_chan_between_nodes_with_value(&nodes, 3, 0, 1_000_000, 0);
 
                // With all peers connected we should get all hints that have sufficient value
                let mut scid_aliases = HashSet::new();
@@ -717,13 +841,13 @@ mod test {
 
                // With only one sufficient-value peer connected we should only get its hint
                scid_aliases.remove(&chan_b.0.short_channel_id_alias.unwrap());
-               nodes[0].node.peer_disconnected(&nodes[2].node.get_our_node_id(), false);
+               nodes[0].node.peer_disconnected(&nodes[2].node.get_our_node_id());
                match_invoice_routes(Some(1_000_000_000), &nodes[0], scid_aliases.clone());
 
                // If we don't have any sufficient-value peers connected we should get all hints with
                // sufficient value, even though there is a connected insufficient-value peer.
                scid_aliases.insert(chan_b.0.short_channel_id_alias.unwrap());
-               nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
+               nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id());
                match_invoice_routes(Some(1_000_000_000), &nodes[0], scid_aliases);
        }
 
@@ -733,7 +857,7 @@ mod test {
                let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
                let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
                let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
-               let chan_1_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_1_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 100000, 10001);
 
                // Create an unannonced channel between `nodes[2]` and `nodes[0]`, for which the
                // `msgs::ChannelUpdate` is never handled for the node(s). As the `msgs::ChannelUpdate`
@@ -742,9 +866,9 @@ mod test {
                private_chan_cfg.channel_handshake_config.announced_channel = false;
                let temporary_channel_id = nodes[2].node.create_channel(nodes[0].node.get_our_node_id(), 1_000_000, 500_000_000, 42, Some(private_chan_cfg)).unwrap();
                let open_channel = get_event_msg!(nodes[2], MessageSendEvent::SendOpenChannel, nodes[0].node.get_our_node_id());
-               nodes[0].node.handle_open_channel(&nodes[2].node.get_our_node_id(), channelmanager::provided_init_features(), &open_channel);
+               nodes[0].node.handle_open_channel(&nodes[2].node.get_our_node_id(), &open_channel);
                let accept_channel = get_event_msg!(nodes[0], MessageSendEvent::SendAcceptChannel, nodes[2].node.get_our_node_id());
-               nodes[2].node.handle_accept_channel(&nodes[0].node.get_our_node_id(), channelmanager::provided_init_features(), &accept_channel);
+               nodes[2].node.handle_accept_channel(&nodes[0].node.get_our_node_id(), &accept_channel);
 
                let tx = sign_funding_transaction(&nodes[2], &nodes[0], 1_000_000, temporary_channel_id);
 
@@ -775,9 +899,9 @@ mod test {
                let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
                let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
                let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
-               let _chan_1_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let _chan_1_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 100000, 10001);
 
-               let chan_2_0 = create_announced_chan_between_nodes_with_value(&nodes, 2, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_2_0 = create_announced_chan_between_nodes_with_value(&nodes, 2, 0, 100000, 10001);
                nodes[2].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &chan_2_0.1);
                nodes[0].node.handle_channel_update(&nodes[2].node.get_our_node_id(), &chan_2_0.0);
 
@@ -793,11 +917,11 @@ mod test {
                let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
                let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
                let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
-               let chan_1_0 = create_announced_chan_between_nodes_with_value(&nodes, 1, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_1_0 = create_announced_chan_between_nodes_with_value(&nodes, 1, 0, 100000, 10001);
                nodes[0].node.handle_channel_update(&nodes[1].node.get_our_node_id(), &chan_1_0.0);
                nodes[1].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &chan_1_0.1);
 
-               let chan_2_0 = create_announced_chan_between_nodes_with_value(&nodes, 2, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_2_0 = create_announced_chan_between_nodes_with_value(&nodes, 2, 0, 100000, 10001);
                nodes[2].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &chan_2_0.1);
                nodes[0].node.handle_channel_update(&nodes[2].node.get_our_node_id(), &chan_2_0.0);
 
@@ -811,8 +935,8 @@ mod test {
                let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
                let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
                let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
-               let chan_1_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 100_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               let chan_2_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 2, 0, 1_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_1_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 100_000, 0);
+               let chan_2_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 2, 0, 1_000_000, 0);
 
                // As the invoice amt is 1 msat above chan_1_0's inbound capacity, it shouldn't be included
                let mut scid_aliases_99_000_001_msat = HashSet::new();
@@ -850,7 +974,7 @@ mod test {
                let invoice = create_invoice_from_channelmanager_and_duration_since_epoch(
                        &invoice_node.node, invoice_node.keys_manager, invoice_node.logger,
                        Currency::BitcoinTestnet, invoice_amt, "test".to_string(), Duration::from_secs(1234567),
-                       3600).unwrap();
+                       3600, None).unwrap();
                let hints = invoice.private_routes();
 
                for hint in hints {
@@ -878,10 +1002,10 @@ mod test {
                let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
                let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
                let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
-               let chan_0_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_0_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001);
                nodes[0].node.handle_channel_update(&nodes[1].node.get_our_node_id(), &chan_0_1.1);
                nodes[1].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &chan_0_1.0);
-               let chan_0_2 = create_announced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_0_2 = create_announced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001);
                nodes[0].node.handle_channel_update(&nodes[2].node.get_our_node_id(), &chan_0_2.1);
                nodes[2].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &chan_0_2.0);
 
@@ -900,9 +1024,10 @@ mod test {
                let non_default_invoice_expiry_secs = 4200;
 
                let invoice =
-                       crate::utils::create_phantom_invoice::<&test_utils::TestKeysInterface, &test_utils::TestLogger>(
+                       crate::utils::create_phantom_invoice::<&test_utils::TestKeysInterface, &test_utils::TestKeysInterface, &test_utils::TestLogger>(
                                Some(payment_amt), payment_hash, "test".to_string(), non_default_invoice_expiry_secs,
-                               route_hints, &nodes[1].keys_manager, &nodes[1].logger, Currency::BitcoinTestnet
+                               route_hints, &nodes[1].keys_manager, &nodes[1].keys_manager, &nodes[1].logger,
+                               Currency::BitcoinTestnet, None, Duration::from_secs(1234567)
                        ).unwrap();
                let (payment_hash, payment_secret) = (PaymentHash(invoice.payment_hash().into_inner()), *invoice.payment_secret());
                let payment_preimage = if user_generated_pmt_hash {
@@ -911,24 +1036,24 @@ mod test {
                        nodes[1].node.get_payment_preimage(payment_hash, payment_secret).unwrap()
                };
 
-               assert_eq!(invoice.min_final_cltv_expiry(), MIN_FINAL_CLTV_EXPIRY as u64);
+               assert_eq!(invoice.min_final_cltv_expiry_delta(), MIN_FINAL_CLTV_EXPIRY_DELTA as u64);
                assert_eq!(invoice.description(), InvoiceDescription::Direct(&Description("test".to_string())));
                assert_eq!(invoice.route_hints().len(), 2);
                assert_eq!(invoice.expiry_time(), Duration::from_secs(non_default_invoice_expiry_secs.into()));
                assert!(!invoice.features().unwrap().supports_basic_mpp());
 
-               let payment_params = PaymentParameters::from_node_id(invoice.recover_payee_pub_key())
+               let payment_params = PaymentParameters::from_node_id(invoice.recover_payee_pub_key(),
+                               invoice.min_final_cltv_expiry_delta() as u32)
                        .with_features(invoice.features().unwrap().clone())
                        .with_route_hints(invoice.route_hints());
                let params = RouteParameters {
                        payment_params,
                        final_value_msat: invoice.amount_milli_satoshis().unwrap(),
-                       final_cltv_expiry_delta: invoice.min_final_cltv_expiry() as u32,
                };
                let first_hops = nodes[0].node.list_usable_channels();
                let network_graph = &node_cfgs[0].network_graph;
                let logger = test_utils::TestLogger::new();
-               let scorer = test_utils::TestScorer::with_penalty(0);
+               let scorer = test_utils::TestScorer::new();
                let random_seed_bytes = chanmon_cfgs[1].keys_manager.get_secure_random_bytes();
                let route = find_route(
                        &nodes[0].node.get_our_node_id(), &params, &network_graph,
@@ -999,17 +1124,20 @@ mod test {
                let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
                let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 
-               create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001);
+               create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001);
 
                let payment_amt = 20_000;
-               let (payment_hash, _payment_secret) = nodes[1].node.create_inbound_payment(Some(payment_amt), 3600).unwrap();
+               let (payment_hash, _payment_secret) = nodes[1].node.create_inbound_payment(Some(payment_amt), 3600, None).unwrap();
                let route_hints = vec![
                        nodes[1].node.get_phantom_route_hints(),
                        nodes[2].node.get_phantom_route_hints(),
                ];
 
-               let invoice = crate::utils::create_phantom_invoice::<&test_utils::TestKeysInterface, &test_utils::TestLogger>(Some(payment_amt), Some(payment_hash), "test".to_string(), 3600, route_hints, &nodes[1].keys_manager, &nodes[1].logger, Currency::BitcoinTestnet).unwrap();
+               let invoice = crate::utils::create_phantom_invoice::<&test_utils::TestKeysInterface,
+                       &test_utils::TestKeysInterface, &test_utils::TestLogger>(Some(payment_amt), Some(payment_hash),
+                               "test".to_string(), 3600, route_hints, &nodes[1].keys_manager, &nodes[1].keys_manager,
+                               &nodes[1].logger, Currency::BitcoinTestnet, None, Duration::from_secs(1234567)).unwrap();
 
                let chan_0_1 = &nodes[1].node.list_usable_channels()[0];
                assert_eq!(invoice.route_hints()[0].0[0].htlc_minimum_msat, chan_0_1.inbound_htlc_minimum_msat);
@@ -1037,18 +1165,46 @@ mod test {
                let description_hash = crate::Sha256(Hash::hash("Description hash phantom invoice".as_bytes()));
                let non_default_invoice_expiry_secs = 4200;
                let invoice = crate::utils::create_phantom_invoice_with_description_hash::<
-                       &test_utils::TestKeysInterface, &test_utils::TestLogger,
+                       &test_utils::TestKeysInterface, &test_utils::TestKeysInterface, &test_utils::TestLogger,
                >(
                        Some(payment_amt), None, non_default_invoice_expiry_secs, description_hash,
-                       route_hints, &nodes[1].keys_manager, &nodes[1].logger, Currency::BitcoinTestnet
+                       route_hints, &nodes[1].keys_manager, &nodes[1].keys_manager, &nodes[1].logger,
+                       Currency::BitcoinTestnet, None, Duration::from_secs(1234567),
                )
                .unwrap();
                assert_eq!(invoice.amount_pico_btc(), Some(200_000));
-               assert_eq!(invoice.min_final_cltv_expiry(), MIN_FINAL_CLTV_EXPIRY as u64);
+               assert_eq!(invoice.min_final_cltv_expiry_delta(), MIN_FINAL_CLTV_EXPIRY_DELTA as u64);
                assert_eq!(invoice.expiry_time(), Duration::from_secs(non_default_invoice_expiry_secs.into()));
                assert_eq!(invoice.description(), InvoiceDescription::Hash(&crate::Sha256(Sha256::hash("Description hash phantom invoice".as_bytes()))));
        }
 
+       #[test]
+       #[cfg(feature = "std")]
+       fn create_phantom_invoice_with_custom_payment_hash_and_custom_min_final_cltv_delta() {
+               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 nodes = create_network(3, &node_cfgs, &node_chanmgrs);
+
+               let payment_amt = 20_000;
+               let route_hints = vec![
+                       nodes[1].node.get_phantom_route_hints(),
+                       nodes[2].node.get_phantom_route_hints(),
+               ];
+               let user_payment_preimage = PaymentPreimage([1; 32]);
+               let payment_hash = Some(PaymentHash(Sha256::hash(&user_payment_preimage.0[..]).into_inner()));
+               let non_default_invoice_expiry_secs = 4200;
+               let min_final_cltv_expiry_delta = Some(100);
+               let duration_since_epoch = Duration::from_secs(1234567);
+               let invoice = crate::utils::create_phantom_invoice::<&test_utils::TestKeysInterface,
+                       &test_utils::TestKeysInterface, &test_utils::TestLogger>(Some(payment_amt), payment_hash,
+                               "".to_string(), non_default_invoice_expiry_secs, route_hints, &nodes[1].keys_manager, &nodes[1].keys_manager,
+                               &nodes[1].logger, Currency::BitcoinTestnet, min_final_cltv_expiry_delta, duration_since_epoch).unwrap();
+               assert_eq!(invoice.amount_pico_btc(), Some(200_000));
+               assert_eq!(invoice.min_final_cltv_expiry_delta(), (min_final_cltv_expiry_delta.unwrap() + 3) as u64);
+               assert_eq!(invoice.expiry_time(), Duration::from_secs(non_default_invoice_expiry_secs.into()));
+       }
+
        #[test]
        #[cfg(feature = "std")]
        fn test_multi_node_hints_includes_single_channels_to_participating_nodes() {
@@ -1062,8 +1218,8 @@ mod test {
                let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
                let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 
-               let chan_0_1 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               let chan_0_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_0_1 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001);
+               let chan_0_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001);
 
                let mut scid_aliases = HashSet::new();
                scid_aliases.insert(chan_0_1.0.short_channel_id_alias.unwrap());
@@ -1091,9 +1247,9 @@ mod test {
                let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
                let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
 
-               let chan_0_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               let chan_0_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 3, 1000000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               let chan_1_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 3, 3_000_000, 10005, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_0_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001);
+               let chan_0_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 3, 1000000, 10001);
+               let chan_1_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 3, 3_000_000, 10005);
 
                let mut scid_aliases = HashSet::new();
                scid_aliases.insert(chan_0_2.0.short_channel_id_alias.unwrap());
@@ -1122,8 +1278,8 @@ mod test {
                let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
                let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
 
-               let chan_0_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               let chan_0_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 3, 1000000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_0_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001);
+               let chan_0_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 3, 1000000, 10001);
 
                // Create an unannonced channel between `nodes[1]` and `nodes[3]`, for which the
                // `msgs::ChannelUpdate` is never handled for the node(s). As the `msgs::ChannelUpdate`
@@ -1132,9 +1288,9 @@ mod test {
                private_chan_cfg.channel_handshake_config.announced_channel = false;
                let temporary_channel_id = nodes[1].node.create_channel(nodes[3].node.get_our_node_id(), 1_000_000, 500_000_000, 42, Some(private_chan_cfg)).unwrap();
                let open_channel = get_event_msg!(nodes[1], MessageSendEvent::SendOpenChannel, nodes[3].node.get_our_node_id());
-               nodes[3].node.handle_open_channel(&nodes[1].node.get_our_node_id(), channelmanager::provided_init_features(), &open_channel);
+               nodes[3].node.handle_open_channel(&nodes[1].node.get_our_node_id(), &open_channel);
                let accept_channel = get_event_msg!(nodes[3], MessageSendEvent::SendAcceptChannel, nodes[1].node.get_our_node_id());
-               nodes[1].node.handle_accept_channel(&nodes[3].node.get_our_node_id(), channelmanager::provided_init_features(), &accept_channel);
+               nodes[1].node.handle_accept_channel(&nodes[3].node.get_our_node_id(), &accept_channel);
 
                let tx = sign_funding_transaction(&nodes[1], &nodes[3], 1_000_000, temporary_channel_id);
 
@@ -1180,9 +1336,9 @@ mod test {
                let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
                let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 
-               let chan_0_1 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_0_1 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001);
 
-               let chan_2_0 = create_announced_chan_between_nodes_with_value(&nodes, 2, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_2_0 = create_announced_chan_between_nodes_with_value(&nodes, 2, 0, 100000, 10001);
                nodes[2].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &chan_2_0.1);
                nodes[0].node.handle_channel_update(&nodes[2].node.get_our_node_id(), &chan_2_0.0);
 
@@ -1213,12 +1369,12 @@ mod test {
                let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
                let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
 
-               let chan_0_2 = create_announced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_0_2 = create_announced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001);
                nodes[0].node.handle_channel_update(&nodes[2].node.get_our_node_id(), &chan_0_2.1);
                nodes[2].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &chan_0_2.0);
-               let _chan_1_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let _chan_1_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 2, 100000, 10001);
 
-               let chan_0_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 3, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_0_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 3, 100000, 10001);
 
                // Hints should include `chan_0_3` from as `nodes[3]` only have private channels, and no
                // channels for `nodes[2]` as it contains a mix of public and private channels.
@@ -1247,10 +1403,10 @@ mod test {
                let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
                let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 
-               let _chan_0_1_low_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 100_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               let chan_0_1_high_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 10_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               let _chan_0_1_medium_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 1_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               let chan_0_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let _chan_0_1_low_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 100_000, 0);
+               let chan_0_1_high_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 10_000_000, 0);
+               let _chan_0_1_medium_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 1_000_000, 0);
+               let chan_0_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001);
 
                let mut scid_aliases = HashSet::new();
                scid_aliases.insert(chan_0_1_high_inbound_capacity.0.short_channel_id_alias.unwrap());
@@ -1278,9 +1434,9 @@ mod test {
                let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
                let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
 
-               let chan_0_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 1_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               let chan_0_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 3, 100_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
-               let chan_1_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 3, 200_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let chan_0_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 1_000_000, 0);
+               let chan_0_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 3, 100_000, 0);
+               let chan_1_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 3, 200_000, 0);
 
                // Since the invoice 1 msat above chan_0_3's inbound capacity, it should be filtered out.
                let mut scid_aliases_99_000_001_msat = HashSet::new();
@@ -1354,7 +1510,10 @@ mod test {
                        .map(|route_hint| route_hint.phantom_scid)
                        .collect::<HashSet<u64>>();
 
-               let invoice = crate::utils::create_phantom_invoice::<&test_utils::TestKeysInterface, &test_utils::TestLogger>(invoice_amt, None, "test".to_string(), 3600, phantom_route_hints, &invoice_node.keys_manager, &invoice_node.logger, Currency::BitcoinTestnet).unwrap();
+               let invoice = crate::utils::create_phantom_invoice::<&test_utils::TestKeysInterface,
+                       &test_utils::TestKeysInterface, &test_utils::TestLogger>(invoice_amt, None, "test".to_string(),
+                               3600, phantom_route_hints, &invoice_node.keys_manager, &invoice_node.keys_manager,
+                               &invoice_node.logger, Currency::BitcoinTestnet, None, Duration::from_secs(1234567)).unwrap();
 
                let invoice_hints = invoice.private_routes();
 
@@ -1377,4 +1536,20 @@ mod test {
                }
                assert!(chan_ids_to_match.is_empty(), "Unmatched short channel ids: {:?}", chan_ids_to_match);
        }
+
+       #[test]
+       fn test_create_invoice_fails_with_invalid_custom_min_final_cltv_expiry_delta() {
+               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 nodes = create_network(2, &node_cfgs, &node_chanmgrs);
+               let result = crate::utils::create_invoice_from_channelmanager_and_duration_since_epoch(
+                       &nodes[1].node, nodes[1].keys_manager, nodes[1].logger, Currency::BitcoinTestnet,
+                       Some(10_000), "Some description".into(), Duration::from_secs(1234567), 3600, Some(MIN_FINAL_CLTV_EXPIRY_DELTA - 4),
+               );
+               match result {
+                       Err(SignOrCreationError::CreationError(CreationError::MinFinalCltvExpiryDeltaTooShort)) => {},
+                       _ => panic!(),
+               }
+       }
 }