ctrlpanel/app/Notifications/ServersSuspendedNotification.php

<?php

namespace App\Notifications;

use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Messages\MailMessage;
use Illuminate\Notifications\Notification;

class ServersSuspendedNotification extends Notification implements ShouldQueue
{
    use Queueable;

    /**
     * Create a new notification instance.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    /**
     * Get the notification's delivery channels.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function via($notifiable)
    {
        return ['mail' , 'database'];
    }

    /**
     * Get the mail representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return \Illuminate\Notifications\Messages\MailMessage
     */
    public function toMail($notifiable)
    {
        return (new MailMessage)
                    ->subject(__('Your servers have been suspended!'))
                    ->greeting(__('Your servers have been suspended!'))
                    ->line(__("To automatically re-enable your server/s, you need to purchase more credits."))
                    ->action(__('Purchase credits'), route('store.index'))
                    ->line(__('If you have any questions please let us know.'));
    }

    /**
     * Get the array representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function toArray($notifiable)
    {
        return [
            'title'   => __('Your servers have been suspended!'),
            'content' => "
                <h5>". __('Your servers have been suspended!')."</h5>
                <p>". __("To automatically re-enable your server/s, you need to purchase more credits.")."</p>
                <p>". __('If you have any questions please let us know.')."</p>
                <p>". __('Regards').",<br />" . config('app.name', 'Laravel') . "</p>
            ",
        ];
    }
}