When creating the DSS service; the endpoint URL is provided on the Service Dashboard. You have the option to access the service via HTTP/HTTPS.
You can create the endpoint on the ESB. You have options to access the endpoint in the following formats : POX, SOAP1.1, SOAP1.2, GET...
http://wso2.com/project/esb/java/3.0.0/docs/endpoint_guide.html