---
title: "Idempotency Key"
description: "A stable request key used to prevent the same logical mutation from being applied twice on retry. It is critical for side-effecting operations such as booking, payment and order creation."
---

# Idempotency Key

Duplicate-operation guard

A stable request key used to prevent the same logical mutation from being applied twice on retry. It is critical for side-effecting operations such as booking, payment and order creation.