Laravel Notifications: Multi-Channel Alerts

php artisan make:notification OrderShipped

class OrderShipped extends Notification
{
    public function via($notifiable)
    {
        return ['mail', 'database'];
    }

    public function toMail($notifiable)
    {
        return (new MailMessage)
            ->line('Your order has shipped!')
            ->action('View Order', url('/orders/'.$this->order->id));
    }

    public function toArray($notifiable)
    {
        return ['order_id' => $this->order->id];
    }
}

$user->notify(new OrderShipped($order));