Abstract: Payment processing systems has evolved over the years, ever since the introduction of e-Business and e-Commerce applications back in the 1990’s. In this study, the reseracher introduces a proposed mobile-online payment processing system that is envisioned to provide the actual process for the transfer of payments between online buyers and online sellers using an online mobile payment gateway linked to customer’s and merchant’s banks, credit card accounts and mobile service providers. The proposed system is designed to serve both micro and macro payments side by side. In micro payments, the actual players are the buyers, sellers, payment gateways and mobile service providers. For macro payments the main players are buyers, sellers, payment gateways and banks. The system can be used by all type of online e-Commerce websites, e-Commerce applications and person to person payment platforms. Micro payments deals with low cost and low volume products or services purchases such as buying a soft drink or purchasing a movie ticket while macro payments deal with high to moderate cost transactions with high volume trading model. Based on the need for an aggregated payment processing system the reseracher proposes anmobile-online payment processing system that handles micro and macro payments in a secure and easy to use fashion.