@abc.abstractmethod<EOL><INDENT>def get_bank_notification_session(self, bankreceiver):<DEDENT>
return<EOL>
Gets the notification session for notifications pertaining to bank service changes.

        :param bankreceiver: the bank receiver interface
        :type bankreceiver: ``osid.assessment.BankReceiver``
        :return: a ``BankNotificationSession``
        :rtype: ``osid.assessment.BankNotificationSession``
        :raise: ``NullArgument`` -- ``bank_receiver`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``Unimplemented`` -- ``supports_bank_notification() is false``

        *compliance: optional -- This method must be implemented if
        ``supports_bank_notification()`` is true.*