idempotency_key_reuse

HTTP 409§9.2 Request shape: validation, filtering, pagination, idempotency

This key was already used for a different request - another endpoint, or a different body. A key identifies one request; send a new one.

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

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