Follow the instructions below to install Walution add-on from the Google Workspace Marketplace. Walution add-on allows unlimited Whatsapp messages to be sent.
Click on Extensions > Add-ons > Get add-ons.
Type Walution in the search bar and press Enter.
Click on the Walution tile from the Search results.
Click on Install and follow the steps that appear on the screen.
You are going to be asked to grant permissions and to associate the add-on with a Google account.
Click on Done to complete the installation.
Now you are ready to setup your phone to start sending bulk WhatsApp messages.
The add-on can also be directly installed from the Google Workspace Marketplace.