code: def compress(self):
          
  
          method, url = get_URL('compress')
  
          payload = {
              'apikey': self.config.get('apikey'),
              'logintoken': self.session.cookies.get('logintoken'),
              'transferid': self.transfer_id
              }
  
          res = getattr(self.session, method)(url, params=payload)
  
          if res.status_code == 200:
              return True
  
          hellraiser(res)
docs: Compress files on the server side after transfer complete
           and make zip available for download.
  
          :rtype: ``bool``