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Article:
  Build a .NET App for Google Checkout
Subject:   New Order Notification issue
Date:   2007-12-03 23:45:29
From:   momander
Response to: New Order Notification issue

This could happen if there is a timeout. If the Checkout system doesn't get a response from you within 10 seconds, it assumes you didn't get it and retries later. But you may have heard the notification and your response back to Google may simply have been delayed by general Internet slowness.
So you should detect and ignore duplicate notifications. The notification's serial-number remains the same for all retries, so this is a good fiel to check.