This method allows you mark an existing notification as seen which means it will no longer be returned from the unseen API or within the web interface.
/api/v2/notification/mark_as_seen
This method can only be used by user access tokens. Application wide tokens do not have access to this method.
id
- the ID of the notification you wish to mark as seen (optional - if ommitted all notifications for user will be marked as read)This method will return the notification data as shown on the unseen notifications page.