# 400 - Syntax

## Description

Ratepay declines requests that are incomplete or have incorrect syntax.

## Error Handling

The sender receives a notification on failed validations and must correct the respective details to submit a new request.

Displaying an error message to the buyer is recommended.

## Example

A syntactically incorrect request, such as a missing mandatory field, submitting 'abcd' instead of an amount, field value exceeding specified maximum length.

## Possible API Calls

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


## Reasons

* INVALID_JSON
* INVALID_FIELDS


## 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. |