# Idempotency Request

Idempotency is a concept where a request can be send multiple times with the same result as the first request, that means the system only performs one process for identical requests.

A request is identical if it is sent with the same request-id. However, the implementation may different in other systems, for example for processing transactions additional parameters such as "order-no, amount" may be required to compliment when decide a request is identical or not.

### How Idempotency Works

<figure><img src="/files/O6DNr5kjv2UpbMZiXn0y" alt=""><figcaption></figcaption></figure>

### Guidance for Idempotency Key <a href="#guide-for-idempotency-key" id="guide-for-idempotency-key"></a>

> **IDEMPOTENCY KEY IN DOKU**
>
> We make `idempotency key` in our system is `Request ID`

To implement this, you must do below :

1. Every API Request must send unique `request ID`.
2. If something happen in Merchant Side and merchant can't get response, then merchant send request again with same request ID and same Request Body, DOKU system will send the same Response body with HTTP Status Code 409 Conflict.


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