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

# v1 Authentication

> Reference the legacy v1 auth model only if you maintain an existing integration.

Use this page only for maintenance of an existing v1 integration.

## Health check

`GET /v1/health-check`

## Example request

```http theme={null}
GET /v1/health-check HTTP/1.1
Host: api.pagou.ai
apiKey: YOUR_V1_TOKEN
```

## Example response

```json theme={null}
{
  "status": "ok"
}
```

## Common error

```json theme={null}
{
  "message": "Unauthorized"
}
```

Fix: confirm the integration still uses the correct v1 credential set. New integrations should use [v2 authentication](/start-here/authentication).