def copy_notification_service(app, old_app)
        return unless old_app["notification_service"]
        notification_service = app.build_notification_service
        copy_attributes_with_mapping(NOTIFICATION_SERVICE_FIELDS_MAPPING, old_app["notification_service"], notification_service)
        app.notification_service.type = normalize_notification_service_classname(old_app["notification_service"]["_type"])