كيف تحول laravel public channel ل private channel

أنا أريد أن احول   laravel public channel ل private channel  لكي تعمل مع pusher بدون  laravel echo

و هذا الكود في ملف  events/newNotification  

class NewNotification implements ShouldBroadcast
{
    use Dispatchable, InteractsWithSockets, SerializesModels;

    /**
     * Create a new event instance.
     *
     * @return void
     */

    protected $user_id;
    protected $comment;
    protected $user_name;
    protected $post_id;
    protected $data;
    protected $time;
    protected $post_user_id;

    public function __construct($data = [])
    {
        $this->user_id      = $data['user_id'];
        $this->user_name    = $data['user_name'];
        $this->comment      = $data['comment'];
        $this->post_id      = $data['post_id'];
        $this->post_user_id = $data['post_user_id'];
        $this->date         = date("Y-m-d", strtotime(Carbon::now()));
        $this->time         = date("h:i A", strtotime(Carbon::now()));
    }

    /**
     * Get the channels the event should broadcast on.
     *
     * @return \Illuminate\Broadcasting\Channel|array
    */

    public function broadcastOn()
    {
        return new PrivateChannel('new-notification.'.$this->post_user_id);
        
    }

}

وهذا الكود في ملف blade

 Pusher.logToConsole = true;

    var pusher = new Pusher("4fb4fa908d87ec86abf9", {
        
        
        cluster: 'eu'
    });

    var notificationsWrapper = $('.dropdown-notifications');
    var notificationsToggle = notificationsWrapper.find('a[data-toggle]');
    var notificationsCountElem = notificationsToggle.find('span[data-count]');
    var notificationsCount = parseInt(notificationsCountElem.data('count'));
    var notifications = notificationsWrapper.find('li.scrollable-container');

    // Subscribe to the channel we specified in our Laravel Event
    var channel = pusher.subscribe('private-new-notification.'+1);
    // Bind a function to a Event (the full Laravel class)
    channel.bind('App\\Events\\NewNotification', function (data) {
        var existingNotifications = notifications.html();
        var newNotificationHtml = `<a href="`+data.user_id+`"><div class="media-body"><h6 class="media-heading text-right">` + data.user_name + `</h6> <p class="notification-text font-small-3 text-muted text-right">` + data.comment + `</p><small style="direction: ltr;"><p class="media-meta text-muted text-right" style="direction: ltr;">` + data.date + data.time + `</p> </small></div></div></a>`;
        notifications.html(newNotificationHtml + existingNotifications);
        notificationsCount += 1;
        notificationsCountElem.attr('data-count', notificationsCount);
        notificationsWrapper.find('.notif-count').text(notificationsCount);
        notificationsWrapper.show();
    });
</script>