How to Configure SSL between the Routing Service and the Commerce Foundation Endpoint
For secure deployment, the communication channel between the routing service configured on the presentation tier and the Commerce Foundation in the application tier must be secured using Secure Socket Layer (SSL).
For an example configuration of a endpoint configured with secure bindings using SSL, refer to the procedures under Configuring a SharePoint Routing Service in a Three-Tier Deployment. Procedures under that topic provide an example of a Commerce Foundation endpoint configuration using WCF federated bindings with transport security.