Abstract: Methods, systems, and apparatus, including computer program products, for implementing a software architecture design for a software application implementing cash and liquidity management useful to assure that an organization has sufficient liquidity to fulfill all outstanding debits in time. The application is structured as multiple process components interacting with each other through service interfaces, and multiple service interface operations, each being implemented for a respective process component. The process components include a Accounting process component, a Due Item Management process component, a Payment Processing process component, and a Cash Management process component.