Develop > Presentation layer > WebSphere Commerce integration with WebSphere Portal > Customize WebSphere Commerce Portal integration
Use WebSphere Portal general programming techniques (Web service style)
In this style of programming, a portlet can invoke the backend Web services provided by WebSphere Commerce or a vendor directly without the need for a client library. Although this model is less restrictive than the previous one, you have to write more code and configuration for any customization logic.
Create a JSR portlet is beyond the scope of the WebSphere Commerce documentation. See Rational Application Developer online help for detailed instructions on how to create a new portlet implementation class and other available portlet APIs provided by the WebSphere Portal product.