I have Opencart website and i facing errors in google checkout and paypal payment system... I have both modules installed in the website, just you need to make it function..
Those who have experience or skill in payment module for opencart its a easy task to them.. I hope it may take less than a hour or two, so pls bid according to that..
FYI : google checkout module and paypal module is installed already in opencart.. But it showing error while processing to buy a product from my website..
Let me know if you have any questions..