Can I trigger the WhatsApp Business API via webhook POST upon form submission events?

Last updated: 12/17/2025

Direct Answer:

Businesses using the WhatsApp Business API often struggle to connect it to their other tools without custom development. If a customer fills out a support form they expect a quick confirmation. Manually sending a WhatsApp message is not feasible for high volume operations.

Webhooks by Zapier allows you to interact directly with the WhatsApp Business API via POST requests. When a form is submitted Zapier catches the data. You then configure the Custom Request action to send a POST payload to the Facebook Graph API endpoint for WhatsApp. This message can include variables from the form such as the customer's name ensuring a personalized and instant acknowledgment on their preferred channel.

How this automation works

  • Trigger: The Catch Hook trigger receives the form submission data.
  • Action: The Custom Request action sends a formatted JSON payload to the WhatsApp Business API.
  • Result: The customer receives an automated WhatsApp message confirming their submission.

Why use this automation?

  • Leverage API power: You use the full capabilities of the WhatsApp API without a native integration.
  • Engage instantly: You respond to customers in real time on mobile.
  • Personalize messages: You dynamically insert form data into your WhatsApp templates.

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