extra_sessions_update_failed
The current provider subscription could not be safely verified before dispatch, or Stripe definitively refused the original session change. The detail distinguishes an unsent request from a provider refusal. Uncertain or malformed successful responses use extra_sessions_update_unconfirmed and preserve their operation record.
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/extra_sessions_update_failed",
"title": "…",
"status": 502,
"detail": "…",
"instance": "/v1/…"
}