/// payment_secret type, use to authenticate sender to the receiver and tie MPP HTLCs together
/// (C-not exported) as we just use [u8; 32] directly
#[derive(Hash, Copy, Clone, PartialEq, Eq, Debug)]
/// payment_secret type, use to authenticate sender to the receiver and tie MPP HTLCs together
/// (C-not exported) as we just use [u8; 32] directly
#[derive(Hash, Copy, Clone, PartialEq, Eq, Debug)]