liwo/app/Http/Controllers/NotificationController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class NotificationController extends Controller
{
    public function index($business)
    {
        return Auth::user()->notifications()->where('business_id', $business)->get();
    }

    public function markAsRead($business, $notification)
    {
        return Auth::user()->unreadNotifications()
                ->where('business_id', $business)
                ->findOrFail($notification)
                ->markAsRead();
    }
}