Method: CHECK_DOWNLOAD_TICKET
Method: DEQUEUE_TICKET
Method: GENERATE_DOCUMENT_DOWNLOAD_URL
Method: _FIND_EXISTING_TICKET
Method: CREATE_DOWNLOAD_TICKET
Method: RELEASE_DOWNLOAD_TICKET
Method: _PARSE_REQUEST_PARAMS
Method: WRITE_ERROR_TO_APPL_LOG
Method: DO_REQUEST
Method: ENQUEUE_TICKET