The aim of this research is to explore how On-Line Payment System have significant role in the e-commerce. E-commerce provides the capability of buying and selling products, information and services on the internet and other online environments. In an e-commerce environment, payments take the form of money exchange in an electronic form, and are therefore called online payment. Online payment is secure there should be no threat to the user credit card number, smart card or other personal details, payment can be carried out without involvement of third party. It makes online payment at a time through the internet directly to the transfer settlement and form online business environment. Online payment system is an integral part of electronic commerce. An efficient payments system reduces the cost of exchanging goods and services, and is indispensable to the functioning of the interbank,