Send Notifications to Anyone in Laravel
You can send Laravel Notifications not only to a certain user with $user->notify(), but also to anyone you want, via Notification::route(), with so-called "on-demand" notifications:
Notification::route('mail', 'taylor@example.com')
->route('nexmo', '5555555555')
->route('slack','https://hooks.slack.com/services/...')->notify(new InvoicePaid($invoice));
