<summary> Service contract for Context Handler on X509Cert binding. Used by end user system to retrieve external Reportee Element Context. </summary><summary> Gets the ReporteeElementContext external for a particular ReporteeElementID. </summary> <param name="systemUserName"> System user name is the system identifier for the Agency system as registered in Altinn - mandatory parameter </param> <param name="systemPassword"> System password is the password for the registered Agency system - mandatory parameter </param> <param name="reporteeElementID"> Reportee Element ID- The Reportee Element for which the context is expected. </param> <returns> External Reportee Element Context </returns>https://www.altinn.no/ServiceEngineExternal/ContextHandlerEC2.svc