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Via the XML API, how do you associate an Google Checkout callback serial number with the original order?

On the same line - What does the serial number in the "Option B - Submit a Server-to-Server Checkout API Request" section of the XML API doc correspond to (format: serial-number="981283ea-c324-44bb-a10c-fc3b2eba5707")? Does it relate to the serial sent by the callback URL (numeric-only)?