Send WhatsApp Messages from Google Apps Script - Complete Guide

Automate WhatsApp messaging using Google Apps Script and the WhatsMate WA Gateway REST API

Posted on July 2, 2016   Share on Facebook Share on LinkedIn Share on Twitter Share on Google+

Last reviewed: January 28, 2026  

🚀 Automate WhatsApp Messaging with Google Apps Script

Looking to integrate WhatsApp messaging into your Google Workspace automation? This guide walks you through sending WhatsApp messages using Google Apps Script and the WhatsMate WA Gateway REST API. Perfect for Google Sheets, Docs, and Forms users who want to automate notifications and messaging directly from their Google Workspace environment.

📋 Prerequisites

Before you begin, ensure you have:

  1. A WhatsMate WA Gateway account - Required for API access
  2. Recipient registration - Each recipient must register with the Gateway first
  3. Google account - With access to Google Apps Script
  4. Basic Google Apps Script knowledge - Familiarity with creating and running scripts
  5. Google Workspace access - For integrating with Sheets, Docs, or Forms

⚠️ Important: Recipients must register with the WhatsMate WA Gateway before they can receive messages. Unregistered users will not receive any messages from the Gateway. Registration instructions are available on the official WhatsMate site.

📝 Step-by-Step Implementation

Follow these steps to send your first WhatsApp message from a Google Apps Script:

1. Copy the Google Apps Script Template

Start by copying the following source code to your Apps Script project:

2. Configure a few Parameters

Customize these key parameters in the Google Apps Script code:

  • Line 9: Replace with your gateway instance ID
  • Lines 10-11: Update with your Client ID and Secret
  • Line 2: Specify the target phone number (including the country code, e.g., +1234567890)
  • Line 3: Provide your message content

3. Send Your Message

Run the main() function in your Google Apps Script project to deliver your WhatsApp message.

🔧 Common Use Cases

This Google Apps Script integration approach is ideal for:

  • Google Sheets automation - Send WhatsApp notifications based on spreadsheet data changes
  • Google Forms responses - Automatically message respondents or form owners
  • Google Docs workflows - Trigger messages from document events or approvals
  • Google Workspace automation - Integrate WhatsApp into your business processes

🚀 Get Started Today

Ready to automate WhatsApp messaging from your Google Workspace? You’ll need a trial account to access the API. Sign up for a 2-week trial and start sending messages within minutes!

Next Steps: Once you’ve mastered basic message sending, explore advanced features like sending images, documents, or group messages through the WhatsMate API documentation.