Business logic structure of SaaS-based E-commerce system

The functional requirements of multiple tenants are supported by a single instance in a SaaS System, but the differences between tenants make it difficult to unify in same business logic. Based on the construction of SOA and using BPEL to deploy different processes on application servers, a business process customization model for the application layer is proposed and the specific solution of process customization and implementation are discussed with the combination of Web Service.