> ## Documentation Index
> Fetch the complete documentation index at: https://docs.dubformer.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication

> Learn how to authenticate with the Emotion Transfer TTS API

The Emotion Transfer TTS API uses Bearer token authentication. All API requests must include an `Authorization` header with your API key.

## Getting Your API Key

To get access to the Emotion Transfer TTS API, please contact our sales team at [sales@dubformer.ai](mailto:sales@dubformer.ai).

<Warning>
  Keep your API key secure and never expose it in client-side code. Treat it like a password.
</Warning>

## Making Authenticated Requests

Include your API key in the `Authorization` header of every request:

```bash theme={null}
curl -X GET https://app.dubformer.ai/api/v1/balance \
  -H "Authorization: Bearer YOUR_API_KEY"
```

## Required Headers

Every API request must include:

* `Authorization: Bearer YOUR_API_KEY` - Your authentication token
* `Content-Type: multipart/form-data` - For POST requests with form-data body