Online payment processing service provided by Google
Google Checkout is an online payment processing service offered to people who have a Google Account.
Users store their credit or debit card and shipping information with Google Checkout to help facilitate purchasing at participating online stores with a click of a button.
Other online payment methods include:
Retirement in November 2013
Google has announced this API's retirement in November 2013. For more details, and information on alternative options (e.g. Wallet API for Online Commerce (also known as Wallet Instant Buy) and Wallet API for Digital), refer to the official announcement.
Additional information can also be found in Merchant Help.