# 409 - Conflict

## Description

Ratepay declines requests which create conflicts regarding [idempotency](/docs/developer/api_integration/payment_2.0/idempotency).

## Error Handling

The sender may not reuse the same unique request ID for different calls.

## Example

Two different requests with same idempotency key.

## Possible API Calls

* Authorization
* Incremental Authorization
* Capture
* Refund
* Cancellation
* Add Shipping Information


## Reasons

* IDEMPOTENCY_KEY_ALREADY_USED


## Buyer Messages

| Language | Message |
|  --- | --- |
| de | Es trat ein technischer Fehler auf. Bitte wenden Sie sich an den Shopbetreiber. |
| en | A technical error occurred. Please contact the merchant. |
| fr | Une erreur technique est survenue. Veuillez vous adresser au responsable du site internet. |
| nl | Er is een technische fout opgetreden. Neem alstublieft contact op met de winkelier. |