use IlluminateSupportFacadesMail;
use AppMailWelcomeEmail;

public function sendWelcomeEmail($user) {
    Mail::to($user->email)->send(new WelcomeEmail($user));
}

use IlluminateBusQueueable;
use IlluminateMailMailable;
use IlluminateQueueSerializesModels;
use IlluminateContractsQueueShouldQueue;

class WelcomeEmail extends Mailable
{
    use Queueable, SerializesModels;

    protected $user;

    public function __construct($user)
    {
        $this->user = $user;
    }

    public function build()
    {
        return $this->view('emails.welcome')
            ->with(['user' => $this->user]);
    }
}

use IlluminateSupportFacadesNotification;
use AppNotificationsOrderPlaced;
use AppUser;

public function sendOrderNotification($order) {
    $user = User::find($order->user_id);
    $user->notify(new OrderPlaced($order));
}

use IlluminateBusQueueable;
use IlluminateNotificationsNotification;
use IlluminateContractsQueueShouldQueue;
use IlluminateNotificationsMessagesMailMessage;
use IlluminateNotificationsMessagesBroadcastMessage;

class OrderPlaced extends Notification
{
    use Queueable;

    protected $order;

    public function __construct($order)
    {
        $this->order = $order;
    }

    public function via($notifiable)
    {
        return ['mail', 'database', 'broadcast'];
    }

    public function toMail($notifiable)
    {
        return (new MailMessage)
            ->subject('New Order Placed')
            ->greeting('Hello')
            ->line('A new order has been placed.')
            ->action('View Order', url('/orders/'.$this->order->id))
            ->line('Thank you for using our services!');
    }

    public function toDatabase($notifiable)
    {
        return [
            'order_id' => $this->order->id,
            'message' => 'A new order has been placed.'
        ];
    }

    public function toBroadcast($notifiable)
    {
        return new BroadcastMessage([
            'order_id' => $this->order->id,
            'message' => 'A new order has been placed.'
        ]);
    }
}