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

# API Authentication

> How to authenticate API requests

## Bearer Token

Include your API key in the Authorization header:

```bash theme={null}
Authorization: Bearer txc_live_your_api_key
```

## API Key Types

| Prefix      | Environment |
| ----------- | ----------- |
| `txc_test_` | Sandbox     |
| `txc_live_` | Production  |

## Example Request

```bash theme={null}
curl https://api.txcloud.io/v1/identity/verify \
  -H "Authorization: Bearer txc_live_abc123" \
  -H "Content-Type: application/json" \
  -d '{"document_front": "..."}'
```

<Card title="Full Authentication Guide" icon="key" href="/authentication">
  Learn more about managing API keys
</Card>