There have been reports that Google Checkout may be experiencing some teething problems:

“Merchants and shoppers are complaining that Google’s Checkout often takes too long to complete sales transactions and sometimes cancels orders unjustifiably and without warning.“

Probably not a feature you want from your shopping processing system, obviously.

“a Google staffer in the Checkout team routinely posts comments and answers under the name GoogleCheckoutPro, and on July 27 addressed the review delay issue, saying Google is committed to fighting fraud and minimizing risk: “I know there’s frustration about the delays due to the order review process,” the official wrote, adding to what is one of the longest threads on the board with over 30 postings. “At times it may seem we are overly cautious, especially when an order from someone you know personally is being held up. We are working as fast as possible to fix this issue. The good news is that we have some upcoming changes which will both speed up the review process and make it more effective at filtering out the bad guys.”