The billing integration is a process in which an eCommerce website or online shopping portal is integrated with the payment gateway with the help of different payment developers like 2Checkout or PayPal developers. The payment gateway is a software platform designed for the eCommerce merchants that sell products online through credit card and other payment cards. According to Transactis information, online bill payment market value stands at the second position with about $20 billion volume preceded by POS billing. The integration of an online shopping website is accomplished by the payment developers through API, plugins or web applications.

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