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Connect ChatGPT ​

Connect ChatGPT to your WHMCS through Relyagent's self-hosted MCP server, so ChatGPT can list and call only the WHMCS tools you allow.

Developer-mode connectors required

Custom connectors in ChatGPT live behind developer mode, which needs a ChatGPT plan that supports developer-mode connectors. If you don't see the option below, your plan may not include it.

Prerequisites ​

  • A connection created under Addons → Relyagent → MCP Clients — see Configuration.

  • Its Client ID and Client Secret (the secret is shown only once at creation).

  • The shared Endpoint URL:

    https://<your-whmcs>/modules/addons/relyagent/public/mcp/endpoint.php

Grab the exact values from WHMCS

The Setup tab (Addons → Relyagent → Setup) has a ChatGPT accordion with the Endpoint URL pre-filled and copy-paste steps.

Enable developer mode and create the connector ​

  1. Enable developer mode: in ChatGPT, open Settings → Apps & Connectors → Advanced and enable Developer mode.
  2. Create connector: navigate to Apps & Connectors and click Create.
  3. Set URL: paste the Endpoint URL as the server URL.
  4. Select authentication: choose OAuth as the auth method.
  5. Add credentials: enter the Client ID and Client Secret, then save.

After you create the connector, start the authorization:

  1. You're sent to your native WHMCS admin login — your existing 2FA, brute-force and IP rules apply, because Relyagent shows no login form of its own.
  2. A consent screen lists this connection's tools. Approve it to finish.

Verify it works ​

Ask ChatGPT what WHMCS tools the connector exposes. It should list only the tools you ticked for this connection — nothing more. Any tool outside that set is rejected.

If it won't connect

Make sure you entered both the Client ID and Client Secret and chose OAuth — the Endpoint URL alone isn't enough. Confirm you signed in at the WHMCS admin login and approved consent, and double-check the exact Endpoint URL. See the error reference.

  • Configuration — create and manage connections
  • Setup tab: Addons → Relyagent → Setup
  • MCP tools — what each tool group does

Documentation for the Relyweb app catalogue.

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