> ## Documentation Index
> Fetch the complete documentation index at: https://nango-khaliq-nan-660-add-support-for-personio-apis-to-nango.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication

Use the Nango Secret Key available in your [Environment Settings](https://app.nango.dev/environment-settings) as Bearer token in the `Authorization` header:

```
Authorization: Bearer {nango-secret-key}
```