"Google Checkout is an alternative checkout flow you can use to process sales. While Checkout is designed primarily for transactions involving tangible and digital goods, you may also process transactions for services, subscriptions, and donations (if your organization is 501c3 tax-exempt). All transactions must abide by our content policies. Google Checkout cannot be used as a person to person money transfer service at this time."

http://checkout.google.com/support/sell/bin/answer.py?answer...