Hey All,
Just installed GCO on 1.3.9g and it sort of works. Does send the cart to google and they do take your money, gives an option to return to merchant and on return I'm at the checkout_success page with no order details and there's no order logged in the admin.

Have applied this fix:http://www.zen-cart.com/forum/showpo...&postcount=106

tried again with the same result.

Thanks in advance,
John