RegisterForRemoteNotifications function

Optional+Require.swift

    //Here starts the function definition and scope
    func registerForPushNotifications() {
        
        //Here we are creating a notifCenter reference for shorter lines of code
        let notifCenter = UNUserNotificationCenter.current()
        
        //Here we access the requestAuthorization method that lives on the 
        //UNUserNotificationCenter.  It takes an array of options of an enum type
        //and a closure as arguments.  
        notifCenter.requestAuthorization(options: [.alert, .sound, .badge]) {
            
            //Here are two values that we have access to in the closure definition
            //Access Granted (Bool) is true if the user gave permission to use push 
            //notifications.  
            accessGranted, error in
  
            //Call the other function we defined
            getNotificationSettingsThenRegister()
        }
    }