Agent Builder Pro adds channel integrations on top of the free Agent Builder plugin — WhatsApp, Slack, Email, Google Sheets, and more. Here's a full walkthrough of connecting WhatsApp end to end, including training a mission-specific agent with real knowledge and a human handoff.
What's covered
- Meta developer app — create it, add the WhatsApp Business Platform use case, and get a free test phone number
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Webhook + permanent token — configure the Callback URL, subscribe to the
messagesfield, and generate a non-expiring System User access token - Agent Builder's WhatsApp wizard — paste in credentials, get your webhook URL and verify token back, enable WhatsApp, and set the App Secret (skipping this one silently breaks signature verification)
- Publish the Meta app — required before any real phone can message it; skip this and only test webhooks from Meta's own dashboard will ever arrive
- Training a mission-specific agent — persona, knowledge wiki, and a live WhatsApp reply from the trained agent at the end
One thing the video calls out that cost hours of debugging: an unpublished Meta app silently drops every real webhook while looking correctly configured. Publish it early.
WhatsApp channels are part of Agent Builder Pro. Agent Builder itself is a free WordPress plugin.
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