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2010s   American   business   California   credit card   e-commerce   finance   Jack Dorsey   mobile application   mobile phone   North American   payment   San Francisco   small business   startup   USA   
Square is an electronic payment service, and the name of the card-reading device it uses. Square allows users in the United States to accept credit cards through their mobile phones, either by swiping the card on the Square device or by manually entering the details on the phone.
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