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

# Build an integration

This guide is for developers building an app that calls Mobbin's MCP server on behalf of their
users. Each of your users authorizes with their own Mobbin account, and your app makes MCP requests
using their access token. If you just want to connect an existing MCP client like ChatGPT or Claude,
see [Supported Clients](/mcp/clients/overview).

## Requirements

Your users need to be on a Mobbin **Pro Plan**, **Team Plan**, or **Enterprise Plan**. There is no
separate fee for integrators.

## Setup

Mobbin uses [Dynamic Client Registration (RFC 7591)](https://datatracker.ietf.org/doc/html/rfc7591),
so no `client_id` provisioning or redirect URI whitelisting is needed on Mobbin's side. Follow the
steps below to connect your app:

1. Fetch the protected resource metadata to discover the authorization server:

   ```
   https://api.mobbin.com/.well-known/oauth-protected-resource/mcp
   ```

2. Fetch the authorization server's `.well-known/oauth-authorization-server` to get the full set of
   OAuth endpoints (authorization, token, registration, JWKS, etc.).

3. Register your app via the DCR endpoint to obtain a `client_id`.

4. Redirect the user to the authorization endpoint with PKCE (`S256`) and the `openid` scope.

5. Exchange the authorization code for an access token and refresh token.

6. Call the MCP server at `https://api.mobbin.com/mcp` with a `Bearer` token.

7. Use the refresh token to obtain new access tokens as needed.

For the full protocol details, see the
[MCP authorization specification](https://modelcontextprotocol.io/specification/2025-03-26/basic/authorization).

We strongly recommend using an MCP SDK that handles the OAuth flow automatically. You typically just
need to provide a redirect URI and a token storage hook.

* [TypeScript SDK](https://github.com/modelcontextprotocol/typescript-sdk)
* [Python SDK](https://github.com/modelcontextprotocol/python-sdk)