code: def update(self,
                 message=None,
                 subject=None,
                 days=None,
                 downloads=None,
                 notify=None):
          
  
          method, url = get_URL('update')
  
          payload = {
              'apikey': self.config.get('apikey'),
              'logintoken': self.session.cookies.get('logintoken'),
              'transferid': self.transfer_id,
              }
  
          data = {
              'message': message or self.transfer_info.get('message'),
              'message': subject or self.transfer_info.get('subject'),
              'days': days or self.transfer_info.get('days'),
              'downloads': downloads or self.transfer_info.get('downloads'),
              'notify': notify or self.transfer_info.get('notify')
              }
  
          payload.update(data)
  
          res = getattr(self.session, method)(url, params=payload)
  
          if res.status_code:
              self.transfer_info.update(data)
              return True
  
          hellraiser(res)
docs: Update properties for a transfer.
  
          :param message: updated message to recipient(s)
          :param subject: updated subject for trasfer
          :param days: updated amount of days transfer is available
          :param downloads: update amount of downloads allowed for transfer
          :param notify: update whether to notifiy on downloads or not
          :type message: ``str`` or ``unicode``
          :type subject: ``str`` or ``unicode``
          :type days: ``int``
          :type downloads: ``int``
          :type notify: ``bool``
          :rtype: ``bool``