let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
let cur_height = nodes[0].best_block_info().1;
let (mut onion_payloads, ..) = onion_utils::build_onion_payloads(
let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
let cur_height = nodes[0].best_block_info().1;
let (mut onion_payloads, ..) = onion_utils::build_onion_payloads(