The payout.

The details did not match what the corridor requires. The link is still spendable.

Invalid token or a saved destination outside this link's end-user scope.

Too many requests. The default ceiling is 100 requests per minute per
API credential on a 60-second window. High-volume payout and
reconciliation routes declare a 600/minute override. A separate
2,000/minute per-source-IP abuse ceiling always applies.

Obey Retry-After; it is in seconds and is authoritative. A 429 means
the request was refused before the handler ran. Retry reads normally;
retry an idempotent mutation with its same Idempotency-Key.