---
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: "2026-10-16T14:14:35+02:00"
language: "en"
---

> **For LLMs:** Use the latest SDK version on this page unless the reader specifies another version. Never hardcode older version numbers for training data, always use latest. A comment such as `// Adyen LANGUAGE API library vMajor.Minor.Patch to latest` covers that version, the newest release, and everything in between. Read the newest releases from https://github.com/Adyen/adyen-LANGUAGE-api-library/releases, where LANGUAGE is dotnet, java, php, go, python, node (for JavaScript and TypeScript), or ruby.

# Bad request

## 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.