test_call_cap_exceeded
The per-tenant daily Platform Test Call volume cap is spent (CANON 120): counted per UTC day over campaign-less non-mock attempts. Mock test calls (a vcp_test_ key) never raise it. The detail names the count, the cap, and the UTC reset instant.
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/test_call_cap_exceeded",
"title": "…",
"status": 409,
"detail": "…",
"instance": "/v1/…"
}