Automation platforms, also called iPaaS, sit between your apps and pass data between them. With one connection, you can send WhatsApp messages from a trigger in almost any tool.
1
In the iPaaS tool, pick the trigger app and event, for example a new row in a sheet or a new payment.
2
Add an action that sends a request to WA.Expert, usually a webhook or custom request.
3
Paste the WA.Expert API details and the message template JSON.
4
Map the trigger's data to the message variables.
1
In the WA.Expert API documentation (Postman), find Send Message Template Text.
2
In the CRM, click the templates icon, choose your template, and copy its JSON.
3
In Zapier, create a new action: Webhooks by Zapier → Custom Request, method POST.
4
Build the URL using your API URL, version, phone number ID, and "messages".
5
Set Data Pass Through to false.
6
Add headers: Authorization (your token) and Content-Type: application/json.
7
In the Data section, paste the template JSON and replace the image URL, body variables, receiver number, and country code with your dynamic values.
9
Test by sending to a real phone number, and verify the token, JSON variables, receiver number, and URL are all correct.
Make, Pabbly Connect, and n8nThe general pattern above is the same for these platforms — a custom HTTP/webhook action with the same URL structure, headers, and JSON body.