Connect WhatsApp to ChatGPT

MCP server URL

https://synczap.ai/mcp

Authentication

OAuth 2.1 with PKCE, no key or secret

Permissions

whatsapp:read read synced conversations · whatsapp:send send and act (owner or admin)

Step by step

1. 1

   Create your SyncZap account

   Click Start free trial and create your account. Your organization is created right away, with a 7-day trial and every feature unlocked.

2. 2

   Connect WhatsApp with the QR code

   In the dashboard, open Connections and click Connect WhatsApp. On your phone, open WhatsApp → Linked devices → Link a device and scan the code. SyncZap joins as a linked device, like WhatsApp Web, with no change of number.

3. 3

   Choose which conversations are saved

   In Conversations, turn on sync for the conversations the assistant may read. An owner or admin can also turn on Sync all conversations. The assistant never reads conversations without active sync.

4. 4

   Add the MCP server in ChatGPT

   In ChatGPT (Plus, Pro, Business or higher plan), open Settings → Plugins, click Browse directory and then Add → Add custom MCP server.

5. 5

   Fill in the server details

   Use the name SyncZap. Under Connection, choose Server URL and paste https://synczap.ai/mcp. Under Authentication, choose OAuth: there is no key or secret to copy. Check I understand and want to continue and click Create as a plugin.

   https://synczap.ai/mcp
6. 6

   Authorize and choose the organization

   On the SyncZap screen that opens, sign in, choose the organization and click Allow access. For ChatGPT to send messages, leave the sending option checked; it is shown to owners and admins.

7. 7

   Start asking

   In a new ChatGPT conversation, turn on SyncZap and make a request, like the examples below.

Example requests

• Which conversations went unanswered today?
• Summarize today's conversations with customers.
• Search this week's messages about quotes and list who asked.
• Transcribe Maria's latest voice note and tell me what she asked for.
• Draft a reply to João confirming delivery tomorrow at 10 a.m.

How send confirmation works

1. 1. Prepare

   The assistant prepares the message with the exact recipient and text. Preparing sends nothing.

2. 2. Show

   The assistant shows you who it goes to and what will be sent.

3. 3. Confirm

   Only after your explicit confirmation is it sent, with a code valid only for that recipient and that text.

• Each send has an idempotency key: repeating the same key does not send the message twice, and an unknown result never triggers a new automatic send.
• Accepted means WhatsApp accepted the message, not that it was delivered or read.
• Marking as read and reacting with an emoji need no confirmation, but only work on synced conversations. The contact may see the read receipt and the reaction.
• Automatic transcript delivery is optional and turned on by an owner or admin: SyncZap sends the text of each received voice note to your Message yourself chat or as a reply in the same conversation, where the contact sees it too. Groups are left out unless Include groups is on, and each voice note produces at most one send.

Troubleshooting

I can't find the Add custom MCP server option

The option requires a Plus, Pro, Business or higher plan. On some accounts it is under Settings → Apps & Connectors → Advanced, after turning on Developer mode; the URL and OAuth authentication are the same.

ChatGPT does not show the sending tools

Go to Settings → Plugins → SyncZap → Refresh tools and reconnect. This updates the tool list after a permission change.

The assistant says there are no conversations or messages

Check in Connections that WhatsApp is connected and, in Conversations, that the conversations you want have sync turned on. The assistant only sees synced conversations, and older messages depend on the history the phone sends and on your plan's limit.

Sending is refused or the sending tools do not show up

Sending requires the owner or admin role, the sending option checked when authorizing, and an active paid plan or the trial. If you authorized read-only access, disconnect SyncZap in the assistant and connect again with the sending option checked.

I connected the wrong organization

Each authorization covers one organization. Disconnect SyncZap in the assistant and connect again, choosing the other organization on the SyncZap screen.

The assistant does not transcribe voice notes or read images

AI reading of voice notes, images and PDFs is included from the Pro plan up and in the trial, with a daily limit. The file must be in a synced conversation and still available on the phone.

The phone was unlinked

In Connections, click Connect WhatsApp and scan the new QR code. Messages already saved stay in SyncZap.

How do I revoke access?

Disconnect SyncZap in the assistant's own settings. When someone leaves an organization, the apps they authorized in it are disconnected too.