How to send messages to a WhatsApp group from Google Apps Script

Using the WhatsMate WA Gateway REST API

Posted on April 17, 2017   Share on Facebook Share on LinkedIn Share on Twitter Share on Google+

Last reviewed: April 17, 2024  

This article shows you how to send a message to a WhatsApp group from a Google Apps Script.

You MUST obtain the secret gateway number by signing up for a Forever Green account before you can send a message to a WhatsApp group. Instructions are available on the official site.

To send a WhatsApp group message from a Google Apps Script, do this:

  1. Create a new group with a unique name. The API won’t work if it’s not unique.
    • Create a new WhatsApp group

  2. Add the secret gateway to the group.
    • Name the WhatsApp group

  3. Say “Hi” to the group to let the gateway recognize the new group.
  4. Copy the following source code to your Apps Script project.
  5. Customize the TODO lines in the Google Apps script:
    • Specify your gateway instance ID on line 10.
    • Specify your Client ID and Client secret on lines 11 and 12.
    • Specify the group admin number (i.e. your WhatsApp number including the country code) on line 2.
    • Specify the group name (e.g. Happy Club) on line 3.
    • Specify the content of the message on line 4.
  6. Run the function main() to send your message.

As mentioned at the beginning of this tutorial, you will need a trial account to call the above API. Go sign up now.

Happy coding :)