Appdelegate.swift

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    FIRApp.configure()
        
    let types: UIUserNotificationType = [UIUserNotificationType.Badge, UIUserNotificationType.Alert, UIUserNotificationType.Sound]
    let settings: UIUserNotificationSettings = UIUserNotificationSettings( forTypes: types, categories: nil )
        
    application.registerUserNotificationSettings( settings )
    application.registerForRemoteNotifications()
    return true
}
    
func registerForPushNotifications(application: UIApplication) {
    let settings: UIUserNotificationSettings = UIUserNotificationSettings(forTypes: [.Alert, .Badge, .Sound], categories: nil)
    application.registerUserNotificationSettings(settings)
    application.registerForRemoteNotifications()
}
    
func tokenRefreshNotificaiton(notification: NSNotification) {
    let refreshedToken = FIRInstanceID.instanceID().token()!
}