> For the complete documentation index, see [llms.txt](https://developer.providusbank.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.providusbank.com/reference/api-reference/authentication.md).

# Authentication

## Authentication

To make authorized requests to our API, you need to include the appropriate authentication credentials in your requests. Currently, we support the following authentication methods:

### 1. API Key Authentication

Include your API key in the request headers using the following format:

```http
Authorization: api-key YOUR_API_KEY
```