On the google side there isn't a whole lot to set.

The "my company will only post digitally signes certs" is checked (TRUE)

The callback method is set to: XML

Under "Advanced Settings", Nothing is checked. all FALSE.

And of course the API call back url is

https://www.myshop.com/googlecheckou...nsehandler.php

There aren't really any other settings in the integration screen.

The only other setting is the local tax rate.