About square: Square is a device which changes the smartphone into credit or debit card machine. It implements a new concepts of making payment which is different from the traditional payment method. It make use of iPhone or android mobile device to buy, sell or send money.

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Chapter 16, Problem 4CQ

Program Plan Intro

About square:

Square is a device which changes the smartphone into credit or debit card machine. It implements a new concepts of making payment which is different from the traditional payment method. It make use of iPhone or android mobile device to buy, sell or send money.

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