code: def request_doi_status_by_filename(self, file_name, data_type='result'):
          
  
          endpoint = self.get_endpoint('submissionDownload')
  
          params = {
              'usr': self.api_user,
              'pwd': self.api_key,
              'file_name': file_name,
              'type': data_type
          }
  
          result = self.do_http_request(
              'get',
              endpoint,
              data=params,
              timeout=10,
              custom_header=str(self.etiquette)
          )
  
          return result
docs: This method retrieve the DOI requests status.
  
          file_name: Used as unique ID to identify a deposit.
  
          data_type: [contents, result]
              contents - retrieve the XML submited by the publisher
              result - retrieve a JSON with the status of the submission