def get_bank_notification_session(self, bankreceiver=None):
raise Unimplemented()<EOL>
Gets the notification session for notifications pertaining to bank service changes.

        arg:    bankreceiver (osid.assessment.BankReceiver): the bank
                receiver interface
        return: (osid.assessment.BankNotificationSession) - a
                ``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.*