423200 Google Deposit

We have a site up and running and want to accept payments via Google Checkout. I am uncertain of the Google API's and require assistance to update our current shopping cart to pass the product information to google. If you can deliver to us a demo php script that successfully passes Product information and prices to the Google Checkout form that should be more then enough to get us rolling on processing our orders. We also will need to have orders marked completed on our end, so we will need that explained as well. Cheers!