extra_sessions_not_purchasable

HTTP 409§9.6 Calls, analytics, billing, and exports

Extra concurrent sessions have no Stripe price in this deployment: VOCAPABLE_STRIPE_EXTRA_SESSION_PRICE_ID is unset, so the $200/mo add-on cannot bill. Raised by POST /v1/subscription with extra_sessions > 0 and by PUT /v1/subscription/extra-sessions needing a Stripe change. An operator wires the one licensed plan-independent Price before the add-on sells; no price is invented.

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_not_purchasable",
  "title": "…",
  "status": 409,
  "detail": "…",
  "instance": "/v1/…"
}

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