EventServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;

class EventServiceProvider extends ServiceProvider
{
    /**
     * The event listener mappings for the application.
     *
     * @var array
     */
    protected $listen = [
        \App\Events\OrderCreated::class => [
            \App\Listeners\SendConfirmationEmail::class,
            \App\Listeners\UpdateStock::class,
        ],
        \App\Events\StockIsLow::class => [
            \App\Listeners\SendStockIsLowEmail::class,
        ]
    ];
}