---
title: "Bad request"
url: "https://docs.adyen.com/errors/bad-request"
source_url: "https://docs.adyen.com/errors/bad-request.md"
canonical: "https://docs.adyen.com/errors/bad-request"
last_modified: "2026-05-27T15:14:08+02:00"
language: "en"
---

# Bad request

[View source](/errors/bad-request.md)

## Cause

Adyen APIs return this error when:

* The request is malformed or is not in the expected format.

## Solution

Check the syntax and format of your request.

## Error codes

Find the specific cause and solution for each error code.

### 00\_400 - Bad request

**Cause**: Generic error returned when the request is malformed.\
**Solution**: Check the request syntax.