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

# Idempotency

> You can add an Idempotency Key in the request headers to ensure that a particular operation is only performed once.

You can add an Idempotency Key in the request headers (`x-idempotency-key`)  to ensure that a particular operation is only performed once, regardless of how many times the request is made for 24 hours since the original request. It is used by the backend to identify duplicate requests, preventing the execution of the same operation multiple times. This is useful for operations such as payments or submissions to avoid duplicate processing.

This applies to both Test and Production modes.