# idempotency-mismatch

`https://ckrets.ai/problems/idempotency-mismatch` is a problem type of the ckrets.ai API (RFC 9457: the body is
`application/problem+json` with `type`, `title`, `status` and `detail`; every problem from `/v1` also carries `requestId`).

| Status | Also in the answer | What to do |
|---|---|---|
| 409 | - | that `Idempotency-Key` was used with another request; nothing was made, but it counts as one create; use a new key |

Every type, with its retry rule and headers: [limits.md, "Errors, retries and headers"](/limits.md#errors-retries-and-headers).