@abc.abstractmethod<EOL><INDENT>def register_for_new_authorizations(self):<DEDENT>
pass<EOL>
Register for notifications of new authorizations.

        ``AuthorizationReceiver.newAuthorizations()`` is invoked when a
        new ``Authorization`` appears in this vault.

        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*