A system and method for multi-source transaction processing receives order requests from a client system operated by a user. The order requests may include order placements and order inquiries. For example, an order request may be a placement for a computer system and associated peripherals. The user may have particular fulfillment organization preferences, and different components of the computer system and associated peripherals may be fulfilled by different fulfillment partners. Accordingly, the orders order requests are processed by an order request servicing system to, for example, split the order request into multiple processed order requests and each of the processed order requests is associated with an order request management system and prepared for transmission to the associated order request management system. The order request management systems can utilize the processed order requests to fulfill the order request. The order request management systems transmit order request management system data which provides, for example, order status information, financial information, and other data. The order request servicing system may, for example, internally process the order request management system data associated with an order request, transmit the order request management system data to the client system, or transmit the order request management system data to another system depending upon the nature of the order request management system data. Thus, the order request servicing system can transparently link users to one or more order request management systems. Additionally, the order request management systems can be linked together over a network, such as the Internet, to provide a network of order request management systems.