@property<EOL><INDENT>def api_id(self):<DEDENT>
return self.connection.api_id<EOL>
This allows to list api_ids, if they have been registered through
            api_register() -- LEGACY

            In previous API version, one would connect and register to APIs
            like this

            .. code-block:: python

                self.api_id["database"] = self.database(api_id=1)
                self.api_id["history"] = self.history(api_id=1)
                self.api_id["network_broadcast"] = self.network_broadcast(
                    api_id=1)