let payment_hash = PaymentHash(Sha256::from_engine(sha).into_inner());
// Note that this may fail - our hashes may collide and we'll end up trying to
// double-register the same payment_hash.
let payment_hash = PaymentHash(Sha256::from_engine(sha).into_inner());
// Note that this may fail - our hashes may collide and we'll end up trying to
// double-register the same payment_hash.