The Notification datatype includes various settings.

Table: Notification

idstringyes The unique identifier for the notification.
titlestringyes The title or heading of the notification.
messagestringyes The message for the notification.
dismissablebooleanyes Whether the notification is dismissable.
severityNotificationSeverityyes The severity of the notification: Error, Warning, Info, or Success
typeNotificationTypesyes The type of the notification: Announcement or Banner
linkstring  Link accompanying the notification.
linkDescriptionstringyes A description for the link.

[a] Some arguments may be required, as indicated in this column. For some fields, this column indicates that a result will always be returned for it.