# Authentication

 - [OAuth 2.0 Client Credentials](https://developers.fennoa.com/apis/v2/authentication/oauth-2.0-client-credentials.md): ### OAuth 2.0 Client Credentials This API uses the **OAuth 2.0 Client Credentials** grant for authentication. 1. Obtain an access token by sending a `POST` request to the appropriate token endpoint wi
 - [Required Headers](https://developers.fennoa.com/apis/v2/authentication/required-headers.md): ### Required Headers All API requests must include the following headers: | Header | Value | Description | | --- | --- | --- | | `Authorization` | `Bearer <token>` | OAuth 2.0 access token | | `X-Com