Activity Mapping – This is a dropdown field you can select "WhatsApp Message".
Default WhatsApp Number Fields – This is a dropdown field where multiple value are shown. You can select "mobile number or phone number" where WhatsApp messages will be sent.
Default Country Code – Here India country code will be selected.
Enable Rich Media Template Support – Enable this field.
Compliance Type – Opt-Out or Opt-in select one option.
WhatsApp Opt-Out – According to the above selection, a value will be selected from the drop down field.
Now click on "Save & Close" button, after authentication configuration will be saved.