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Google creates an app for use at the checkout
app:
checkout:

"The technology giant introduced Google Wallet, a mobile application that will allow consumers to pay at a store by waving their cellphones at a retailer's terminal instead of using a credit card [or cash]."

"The app, for the Android operating system also will enable users to redeem special coupons and earn loyalty points."

The Global Edition of the New York Times, May 28-29, 2011; page 15.