Activating this addon will change the layout of your Gateway page a little bit like below.
There are no special settings for this addon other than having multiple gateways for different countries
Clicking on this add another gateway and allow you to add a single country or group of countries to which you want to send OTP Passcode SMS using that gateway.
Gateway setup under this will be used to send SMS to all the countries which are not added below for specific gateways. If you dont want to send SMS to all countries and just want to use the country specific gateways then just fill up 123 in any gateway you are not planning to use.
Priority of the gateway will be from Top to Bottom except the All Countries. So if you have two groups for Twilio and Firebase and both of them contains United States as the country then the one at the top will be used to send SMS to United States.