---
title: 2009: Idempotency conflict. | API Docs
description: This Idempotency-Key was already used with a different request.
---

**HTTP status:** `409`.

The key is bound to an earlier request whose body differs from this one, so the reuse is refused rather than replayed. Nothing new was recorded.

## Troubleshooting

- Use a fresh Idempotency-Key for a new operation.
- Replay the same Idempotency-Key with an identical body to read the original outcome instead of guessing.

## Related

- [Sending a message](/channel/whatsapp/api/resources/chats/subresources/messages/methods/send/index.md)