They plug in the SquareUp credit card reader into their mobile devices and they can magically accept credit card payment.

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Founded in 2009, and headquartered in San Francisco, Square is currently available only in the U.S. More information is available at squareup.com.

ENGADGET: Starbucks switches to Square for payments, invests $25 million and will support Pay with Square

Coalition partners contributing to the resource base include the American Institute of Certified Public Accountants, AVG, Cisco, Constant Contact, docstoc.com, HP, Intacct.com, Microsoft, Salesforce.com, and Squareup.com.

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