---
title: API Documentation for Developers
slug: legacy/vYG0-api-documentation-for-developers
docTags: 
createdAt: 2021-12-23T14:14:07.000Z
---

## Authentication

An API Key is required to access the API. The client need to send authentication's details in the **Authorization header** with a valid API Key.

## Request your API Key

Go to [Customerarea](https://cloud.flashstart.com/customerarea/integrations/api/) and click "Request API Key"

**Other ways to ask**:

- API Documentation Guide for Developers
- Writing Effective API Documentation for Developers