The point of sale (POS) is the time and place where a retail transaction is completed. At the point of sale, the merchant calculates the amount owed by the customer, indicates that amount, may prepare an invoice for the customer, and indicates the options for the customer to make payment. By the time being everything is going paperless, so in this consent point of sale also developed into desktop version and mobile version. For the rising demand for E-commerce, everyone is getting attached to...

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