(2, payment_secret, option),
(4, amount_msat, required),
(6, 0u64, required), // user_payment_id required for compatibility with 0.0.103 and earlier
(2, payment_secret, option),
(4, amount_msat, required),
(6, 0u64, required), // user_payment_id required for compatibility with 0.0.103 and earlier