nshop/packages/Webkul/Notification/src/Providers/ModuleServiceProvider.php

<?php

namespace Webkul\Notification\Providers;

use Webkul\Core\Providers\CoreModuleServiceProvider;

class ModuleServiceProvider extends CoreModuleServiceProvider
{
    /**
     * Models.
     *
     * @var array
     */
    protected $models = [
        \Webkul\Notification\Models\Notification::class,
    ];
}