Connect ChatGPT to WhatsApp Business

Can ChatGPT answer customers and send messages on WhatsApp Business?

Postgale is the secure layer for AI agents on social media. MCP (Model Context Protocol) is the open standard that lets AI assistants such as Claude and Cursor use outside tools. An MCP server is what they connect to. ChatGPT does not reach WhatsApp on its own; with Postgale connected it gets tools for the WhatsApp accounts you connected and nothing else.

What do you need?

• A WhatsApp Business Account and a phone number for it, set up through Meta’s Embedded Signup from the Postgale dashboard, or an existing number connected with its token.
• A Postgale workspace, and a sign-in or an API key for the agent.
• Message templates approved by Meta if the agent must write first or outside the 24-hour window.
• ChatGPT, set up as below (A custom connector (MCP) in ChatGPT developer mode).

Step 1: connect your WhatsApp Business account

1. Create a Postgale workspace and open Dashboard → Accounts.
2. Choose Connect WhatsApp Business and sign in with the account you own, on Meta’s own Embedded Signup page. Postgale stores the tokens encrypted and refreshes them.

Step 2: connect ChatGPT to Postgale

1. Create a Postgale workspace and connect the social accounts the agent may use under Dashboard → Accounts.
2. In ChatGPT, open Settings → Apps & Connectors → Advanced and turn on Developer mode.
3. Choose Create (or Add connector), name it Postgale, paste the server URL and set authentication to OAuth:

https://postgale.com/mcp

1. Create the connector. A Postgale page opens in the browser: sign in, pick the workspace the app may use and approve. The consent page names the app and where it returns to; approve only requests you started yourself.
2. Start a new chat with the Postgale connector enabled and ask: “Which social accounts are connected in Postgale?” ChatGPT calls list_accounts and answers with the accounts and their status.

The menu names are ChatGPT’s and can move; the MCP docs keep the current path for every client.

What can I ask ChatGPT to do on WhatsApp?

Check the connection first: “Which WhatsApp accounts are connected in Postgale?” Then, in plain language:

Ask your agent“Answer the new WhatsApp questions about opening hours. Hold every reply for my approval.”

Ask your agent“Send the “order ready” template to the customer in this conversation.”

Ask your agent“Summarise today’s WhatsApp conversations and list the ones still waiting for an answer.”

{
  "to": "+14155550132",
  "type": "text",
  "text": "Yes, M restocks Tuesday. Want me to hold one?"
}

Which WhatsApp rules does Postgale enforce?

• Free-form replies are allowed for 24 hours after the customer’s last message. Outside that window only approved templates can be sent; Postgale refuses anything else and explains why.
• WhatsApp has no human-agent extension of the window (Instagram and Messenger do); Postgale does not pretend otherwise.
• A number must be registered before it can send; a test number can only message its allowed recipients. Postgale returns the specific error code for each case.
• The business token from Embedded Signup is stored encrypted and never shown to the agent.

How do I keep a person in the loop?

• Approval: tick “Hold posts from this app for approval” when you sign in, or in the Postgale dashboard require approval for the API key the agent uses (or for the whole workspace, or one account). Posts then wait as pending approval; comment replies and moderation, direct messages, WhatsApp sends and edits to live posts wait in the same queue. A person approves, edits or rejects each one in Dashboard → Approvals; the agent’s own key or sign-in cannot approve.
• Tool annotations: every Postgale tool declares whether it only reads, writes, or publishes live, deletes or spends. Clients that honour annotations ask before destructive tools run.
• Audit log: every write the agent makes is recorded with the key or the connected app, the action and the time.
• Revoking: each sign-in appears under Dashboard → Connected apps and each key under Dashboard → API keys; either can be revoked at any time.

What can’t an agent do on WhatsApp through Postgale?

• Send free-form messages outside the 24-hour window. Meta requires an approved template.
• Avoid Meta’s per-conversation charges. Meta bills the WhatsApp Business Account directly for template messages.
• Post to a feed. WhatsApp is messaging only.

Common questions