code: def transaction_commit(self, transaction_id, **kwargs):
          
          if transaction_id not in self.__transactions:
              raise workflows.Error("Attempting to commit unknown transaction")
          self.log.debug("Committing transaction %s", transaction_id)
          self.__transactions.remove(transaction_id)
          self._transaction_commit(transaction_id, **kwargs)
docs: Commit a transaction.
          :param transaction_id: ID of transaction to be committed.
          :param **kwargs: Further parameters for the transport layer.