Methods, systems, and apparatus, including computer program products, for implementing a software architecture design for a software application implementing customer returns handling. The application is structured as multiple process components interacting with each other through service interfaces, and multiple service operations, each being implemented for a respective process component. The process components include an Accounting process component, a Customer Return Processing process component, a Sales Order Processing process component, a Customer Invoice Processing process component, a Due Item Processing process component, a Balance of Foreign Payment Management process component, a Payment Processing process component, a Supply and Demand Matching process component, an Inventory Processing process component, a Site Logistics Processing process component, and an Inbound Delivery Processing process component.