Chapter 3 Design 4. Get mutual consensus on authentication details, data formats, services endpoints, and services protocols from all systems participating in integration; for example: • Get the data formats details, like services integrated will have XML or JSON. • Get the service endpoints and details like service URLs, and port number and its invocation type (verb) or method; for example, POST, GET, PUT, DELETE. • Get the service protocols details such as RESTful or RESTless. • Get the authentication details and encryption-decryption algorithm used to secure data while communicating with two systems; for example, authentication token passed along with these services. Business Layer A DXP provides a separate layer for business logic so that integration and application logic won’t be able to hamper business logic. As shown in Figure 3-1, the business layer has a business controller, business validation, and data transfer object (DTO) Figure 3-16. Business layer The business controller is responsible for receiving and replying to requests. It is responsible for the following: • Redirection: You can redirect the control of an application to business services. 84