This is to identify type of notification. Currently only inapp category is supported.

The Email-id of the person who will be receiving this notification.

The Email-id of the person of the person who is sending notification.

You can add link to notification and the user is redirected to it when he clicks the notification.

The notificatoin message that will be display to user. {{fullName}} variable can be used in message to display the sender name.

The notification could be either activity or actionable.
actionable - Notifications which require some action, like a follow request, leave approval.
activity- Notification which publishes some information
default will be activity