> ## Documentation Index
> Fetch the complete documentation index at: https://docs.payfi.global/llms.txt
> Use this file to discover all available pages before exploring further.

# Idempotency

> Safe retry behavior for partner write requests.

All partner write endpoints require `Idempotency-Key`.

Same key, same method, same path, and same body hash returns the original response with `Idempotency-Replayed: true`.

Same key with a different body returns `409 IDEMPOTENCY_CONFLICT`. A concurrent request with the same key returns `409 IDEMPOTENCY_IN_PROGRESS`.