Google Checkout launched new feature that allows customers to easily cancel an order within 15 minutes of placing it. Shoppers simply navigate to the Order Receipt and click the "Cancel" button at the top of the page.

The Cancel button will be available for up to 15 minutes after placing orders on most Checkout merchant websites. "As long as the button appears, you can cancel an order with one simple click - no questions asked." Shoppers will need to contact sellers directly if the button does not appear, or if they change their mind after the 15-minute time period.

Sellers will be able to see which orders in their inboxes are within the 15-minute cancellation window and which orders have been canceled by buyers.

The Cancel button is not available for purchases of digital content.

http://googlecheckout.blogspot.com/2007/11/now-you-can-cancel-that-order-when-you.html