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

# Hyperline for developers

> Build billing integrations with the Hyperline API, manage operations with the CLI, and connect AI assistants through MCP.

<span id="developer-home" aria-hidden="true" />

Use the REST API to manage billing data, webhooks to keep your application in sync, and embedded components to give customers access to their billing information. The API uses HTTPS and JSON, with Bearer token authentication.

<CardGroup cols={2}>
  <Card title="Make your first request" icon="code" href="/developers/first-request">
    Create a sandbox API key and send your first authenticated request.
  </Card>

  <Card title="Explore the API reference" icon="code" href="/api-reference/endpoints/customers/list-customers-1">
    Review endpoints, request parameters, and responses, starting with customers.
  </Card>

  <Card title="Hyperline CLI" icon="terminal" href="/developers/ai/cli">
    Manage customers, subscriptions, and invoices from your terminal or with an AI coding agent.
  </Card>

  <Card title="MCP server" icon="plug" href="/developers/ai/mcp">
    Connect AI assistants to your Hyperline account to query billing data and perform actions.
  </Card>

  <Card title="Webhooks" icon="webhook" href="/developers/webhooks">
    React to billing events and handle delivery, retries, and signature verification.
  </Card>

  <Card title="Documentation for AI assistants" icon="book-open" href="/developers/ai/overview">
    Give your AI tools access to Hyperline documentation through structured files and the documentation MCP server.
  </Card>
</CardGroup>

## Service endpoints

Use the base URL and API key for the same environment: `test_` keys for sandbox and `prod_` keys for production.

### Production environment

| Service | Base URL |
| - | - |
| Main API | [https://api.hyperline.co](https://api.hyperline.co) |
| Events ingestion API | [https://ingest.hyperline.co](https://ingest.hyperline.co) |
| MCP server | [https://api.hyperline.co/mcp](https://api.hyperline.co/mcp) |
| Browser application | [https://app.hyperline.co](https://app.hyperline.co) |

### Sandbox environment (test mode)

| Service | Base URL |
| - | - |
| Main API | [https://sandbox.api.hyperline.co](https://sandbox.api.hyperline.co) |
| Events ingestion API | [https://sandbox.ingest.hyperline.co](https://sandbox.ingest.hyperline.co) |
| MCP server | [https://sandbox.api.hyperline.co/mcp](https://sandbox.api.hyperline.co/mcp) |
| Browser application | [https://sandbox.app.hyperline.co](https://sandbox.app.hyperline.co) |

## OpenAPI specification

Download the [OpenAPI specification](https://api.hyperline.co/openapi) to generate client libraries or import the API into your testing tools.

For workflows you can configure in the Hyperline application, see the [product documentation](/docs). If you need help with your integration, contact the team via the in-app chat.


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