Allow Google and GroovyCart to talk to each other, this is needed to keep orders using
Google Checkout synchronised with the order on GroovyCart.
If you do not set this up, when customers make an order it will not be displayed on your GroovyCart orders page.
Its not half as scary as it sounds.
You must click on My Sales to go to the next page:
This will take you to the settings page:
Click on Integration to go to the next page:
You must enter your callback URL as:
Once you have done it should allow you to select XML as the callback method.
You must set your callback method to XML.