billing_portal_unavailable
HTTP 502 / 503§9.6 Calls, analytics, billing, and exports
Stripe Billing Portal is unavailable. 503 means gateway/return-origin configuration is missing, the configuration is inactive or permits subscription editing, or required capabilities differ. Protected sessions also require explicit cancellation-disabled evidence and an explicit configuration ID; no default fallback.
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/billing_portal_unavailable",
"title": "…",
"status": "…",
"detail": "…",
"instance": "/v1/…"
}