Eloquent notifiable model that can send notifications to Slack (without any attachment to a model)

SlackNotification.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Notifications\Notifiable;
use Illuminate\Notifications\Notification;

class SlackNotification extends Model
{
    use Notifiable;

    /**
     * @var string
     */
    private $slack_webhook_url;

    /**
     * @param Notification $notification
     * @param string $slackWebhookUrl
     * @return SlackNotification
     */
    public static function sendNotification(Notification $notification, string $slackWebhookUrl): SlackNotification
    {
        return tap(
            (new static),
            function (SlackNotification $slackNotification) use ($slackWebhookUrl, $notification) {
                $slackNotification->slack_webhook_url = $slackWebhookUrl;
                $slackNotification->notify($notification);
            }
        );
    }

    /**
     * @return string
     */
    public function routeNotificationForSlack(): string
    {
        return $this->slack_webhook_url;
    }
}