Connect ChatGPT

This guide walks you through adding the Altoviz MCP server to ChatGPT as a connector, so you can manage invoices, customers, quotes, and more directly from a conversation.

Requirements

• A paid ChatGPT plan — Plus, Pro, Team, or Enterprise. Connectors are not available on the free plan.
• An Altoviz API key. Create one from the Altoviz web app (see the API authentication guide).
• The server URL: https://mcp.altoviz.com

Note

ChatGPT’s connector screens move around between plans and updates. The labels below match the current interface; if something is named slightly differently, look for the equivalent Connectors / Developer mode option in Settings.

Step 1 — Enable Developer mode

Custom MCP connectors live behind Developer mode.

1. Open Settings.
2. Go to Apps & Connectors → Advanced settings.
3. Turn on Developer mode.

Step 2 — Create the connector

1. Go to Settings → Connectors → Create (also shown as Add custom connector / Add MCP server).

2. Fill in the form:

   Field	Value
   Name	Altoviz
   Description	(optional) Altoviz invoicing
   MCP server URL	https://mcp.altoviz.com
   Authentication	OAuth

3. Click Create.

Step 3 — Sign in to Altoviz

After you create the connector, ChatGPT registers itself with the server and opens the Altoviz login page.

1. Paste your Altoviz API key into the login page.
2. Submit.

ChatGPT receives an authorization token and the connector goes live. You won’t need to repeat this on every restart — the token is refreshed automatically.

Step 4 — Use it in a conversation

1. Start (or open) a conversation.

2. Click the More menu (⊕) next to the message box.

3. Select the Altoviz connector to make its tools available.

4. Ask in plain language, for example:

   “Test my Altoviz connection.”

   “List my last 5 invoices.”

   “Create a draft invoice for Acme Corp for 10 hours of consulting at €90.”

ChatGPT will ask you to approve each tool action the first time it runs. Approve to continue.

Deep research & agent use

Once connected, the Altoviz tools are also available where ChatGPT supports connectors in deep research and agent modes — useful for tasks like “summarize my unpaid invoices and draft reminder emails.”

Troubleshooting

• No “Create connector” option — confirm Developer mode is on (Step 1) and that you’re on a paid plan.
• Sign-in fails — make sure you pasted a valid, active API key. Ask ChatGPT to “test my Altoviz connection” to re-check.
• “Couldn’t connect” / discovery errors — confirm the URL is exactly https://mcp.altoviz.com (no trailing path) and that Authentication is set to OAuth.
• Tools missing in a chat — open the ⊕ menu and select the Altoviz connector for that conversation.

See the full FAQ & troubleshooting for more.

Next

• Available tools
• Connect Claude