<summary> External interface for exposing service operations for Broker Service with certificates. Used for end user systems to handle file operations. </summary><summary> Operation for uploading a file to a broker service. </summary> <param name="payload"> contains stream and authentication information Will contain all the data for submitting a Broker Service Payload to Altinn from the EndUserSystem using certificates </param> <returns> A ReceiptBE entity for the initiated broker service </returns><summary> Operation for downloading a file from a broker service. </summary> <param name="userName"> User name is the relevant user name for the enterprise certificate user - mandatory parameter </param> <param name="password"> Password for the corresponding enterprise certificate user - mandatory parameter </param> <param name="fileReference"> The file reference value of the file that should be downloaded. </param> <param name="reportee"> The social security number or organization number of the reportee. </param> <returns> A stream with the content of the file. </returns>https://www.altinn.no/ServiceEngineExternal/BrokerServiceExternalEC2Streamed.svc