Hi Apursell,
Ok, could be something else. Bottom line is that the the code you added on the shopping_cart page is not getting run. Basically, don't worry about getting the install right...just worry about finding the right place in the right file to modify. Just test some different files, in different places, put a big red "hello" (or print("hello"); if its php) somewhere in the code, then save it, and reload the page. Does it show up? Try seeing if you can modify ANYTHING on the shopping_cart page...then put in some google code.
Also, double check you have the GCO mod installed and enabled in admin->payment modules
after that i might be out of ideas!
B
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