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

# Billit

> Connect to the Billit Access Point API with an API key

## Quickstart

Connect to the Billit Access Point API with Nango and make your first authenticated API request. This integration uses API key authentication, not the general Billit API's OAuth flow.

**1. Create the integration**

In Nango, go to **Integrations**, select **Configure New Integration**, then select **Billit**.

**2. Authorize Billit**

Go to **Connections**, select **Add Test Connection**, then enter the Billit environment, master account Party ID, and API key. See the [connect guide](https://nango.dev/docs/api-integrations/billit/connect) for details.

**3. Call the Billit API**

List the entities linked to the Billit master account. Replace the placeholders with your [Environment API key](https://nango.dev/docs/reference/backend/http-api/api-keys.md), integration ID, and connection ID:

**cURL**

```bash theme={null}
curl "https://api.nango.dev/proxy/v1/einvoices/registrations" \
  -H "Authorization: Bearer <NANGO-API-KEY>" \
  -H "Provider-Config-Key: <INTEGRATION-ID>" \
  -H "Connection-Id: <CONNECTION-ID>"
```

**Node**

Install Nango's backend SDK with `npm i @nangohq/node`. Then run:

```typescript theme={null}
import { Nango } from '@nangohq/node';

const nango = new Nango({ apiKey: '<NANGO-API-KEY>' });

const response = await nango.get({
    endpoint: '/v1/einvoices/registrations',
    providerConfigKey: '<INTEGRATION-ID>',
    connectionId: '<CONNECTION-ID>'
});

console.log(response.data);
```

**4. Implement Nango in your app**

Follow the [Auth implementation guide](https://nango.dev/docs/guides/auth/auth-guide.md) to add the connection flow to your application.

## Environments

Billit provides isolated sandbox and production environments. API keys and master account Party IDs are not shared between them.

## Billit integration guides

* [How do I link my Billit account?](https://nango.dev/docs/api-integrations/billit/connect): Find your API key and master account Party ID, then connect the appropriate environment.

Official docs: [Billit Access Point documentation](https://docs.accesspoint.billit.eu/), [authentication](https://docs.accesspoint.billit.eu/docs/authentication), and [sandbox versus production](https://docs.accesspoint.billit.eu/docs/sandbox-vs-production).

## Pre-built syncs & actions for Billit

*No pre-built syncs or actions available yet.*

> [!TIP]
>
> Not seeing the integration you need? [Build your own](https://nango.dev/docs/guides/functions/functions-guide.md) independently.


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