subscription_expansion_unavailable

HTTP 503§9.1 Transport, authentication, and tenancy

Billing is unconfigured or the provider could not verify the upgrade price. An unsuccessful preview may be retried; it does not dispatch a payment.

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/subscription_expansion_unavailable",
  "title": "…",
  "status": 503,
  "detail": "…",
  "instance": "/v1/…"
}

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