checkout_failed
Stripe refused creation of the hosted manual-funding Checkout Session. The local intent remains recoverable by its idempotency key, but no credit is settled until a signed completion arrives.
Problem shape
Every non-2xx response is an RFC 9457 application/problem+json body. The type URI below is stable and machine-matchable, so branch on the final path segment (the code) and treat the status as redundant confirmation. See the error-handling guide.
{
"type": "https://docs.vocapable.com/errors/checkout_failed",
"title": "…",
"status": 502,
"detail": "…",
"instance": "/v1/…"
}