code: def get_temp_url_key(self, cached=True):
          
          meta = self._cached_temp_url_key
          if not cached or not meta:
              key = "temp_url_key"
              meta = self.get_account_metadata().get(key)
              self._cached_temp_url_key = meta
          return meta
docs: Returns the current TempURL key, or None if it has not been set.
  
          By default the value returned is cached. To force an API call to get
          the current value on the server, pass `cached=False`.