code: def base_fee(self):
          
          latest_ledger = self.ledgers(order='desc', limit=1)
          try:
              base_fee = latest_ledger['_embedded']['records'][0]['base_fee_in_stroops']
          except (KeyError, IndexError):
              base_fee = 100
          return base_fee
docs: Fetch the base fee from the latest ledger.
          In the future, we'll fetch the base fee from `/fee_stats`
          :return: base free
          :rtype: int