# idempotency_key_reused

**The Idempotency-Key was used for a different request.**

| | |
|---|---|
| HTTP status | `409` |
| `code` | `idempotency_key_reused` |
| Retry? | No, fix the request first |

## What it means

Within the last 24 hours this API key already sent a request with the same `Idempotency-Key` but a different path or body.

## How to fix it

Generate a new key for every new request. Reuse a key only to repeat the exact same request. → [Idempotency](https://docs.kalender-sync.de/en/api/idempotency/)

## Example

```json
{
  "type": "https://docs.kalender-sync.de/en/api/errors/idempotency_key_reused",
  "title": "Conflict",
  "status": 409,
  "code": "idempotency_key_reused",
  "detail": "This Idempotency-Key was used for a different request.",
  "request_id": "req_…"
}
```

→ [All error codes](https://docs.kalender-sync.de/en/api/errors/)