http://google.com/search?q=GoogleCheck
Who has made their first experience with it?
----
It now appears (20140102) that: 
* Google Checkout has been retired. You can no longer process orders. 
** The last day to process refunds was December 20, 2013.
** they have posted a notice: 
*** As of September 9, 2013, the Checkout Sunset Terms of Service (US | UK) shall supplement your existing Checkout Seller Terms of Service