Payment Statuses
Meaning of the current invoice states.
PENDING: eligible for its exact transfer until the payment timestamp passes expiry.PAID: one exact transfer settled successfully.UNDERPAID/OVERPAID: historical attribution states; do not fulfill without review.EXPIRED: the advertised window closed. A transfer timestamped before expiry may still settle during recovery.CANCELLED: checkout is closed; cancellation does not invalidate an on-chain transfer already sent.