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I'm new to Google checkout, I went throw the examples but still have some problems.

I'm able to create the order throw HTML and XML, but I need to be able to know in my system that the order was payed. I try the notification callback an polling, but I'm not sure how can I link the Google order with my order in the system. I check the response XML but didn't found any way how to post my ID and get it back. There is merchant-private-data, but I'm not getting the value back. Can anyone help me?