Hello Sir, NotificationHandler.shared.receivedNotification(userInfo) code is calling a static function of my custom class NotificationHandler. The class NotificationHandler simply handles navigation to different pages when the notification is tapped according to userInfo dictionary received during the notification. Suppose if the notification related to your post is received and when the user taps to the notification, it navigates to your post. Please let me know if you have further confusions, I will try my best to explain you if I can.