https://checkout.google.com/support/sell/bin/answer.py?answer=25397&hl=en
https://services.google.com/training/checkout/order_processing/order_processing_demo.html
https://checkout.google.com/support/sell/bin/answer.py?answer=25397&hl=en
https://services.google.com/training/checkout/order_processing/order_processing_demo.html