The term e-commerce is one way to express the potential of ICT to reshape all kinds of economic transaction processes. It affects all stages of communication before, during and after deliver of goods or services, and the payment flow respectively. This paper finds out how within the field of e-commerce a new breed of B2C and P2P market segments for buying and selling digital goods and services is emerging. The paper also focuses on the integration of payments and payment related steps in both areas of retail e- commerce. The paper makes an in depth analysis of the interfaces between actors and theirrespective systems, e.g. between customer and merchant, merchant and payment service provider, payment service provider and banking system. The paper is basically intended to make us understand how the process of economic development within a community is integrated with the new ICT based services especially e-commerce in developing countries.