invoiceninja/app/Notifications/Ninja/VerifyUser.php

<?php

namespace App\Notifications\Ninja;

use App\Mail\Signup\NewSignup;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Notifications\Messages\MailMessage;
use Illuminate\Notifications\Messages\SlackMessage;
use Illuminate\Notifications\Notification;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;

class VerifyUser extends Notification implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    /**
     * Create a new notification instance.
     *
     * @return void
     */
    protected $user;

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

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

    /**
     * Get the mail representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return \Illuminate\Notifications\Messages\MailMessage
     */
    public function toMail($notifiable)
    {
        $data = [
            'title' => ctrans('texts.confirmation_subject'),
            'message' => ctrans('texts.confirmation_message'),
            'url' => url("/user/confirm/{$this->user->confirmation_code}"),
            'button' => ctrans('texts.button_confirmation_message'),
            'signature' => '',
            'logo' => 'https://www.invoiceninja.com/wp-content/uploads/2019/01/InvoiceNinja-Logo-Round-300x300.png',
        ];

        return (new MailMessage)
                    ->subject(ctrans('texts.confirmation_subject'))
                    ->markdown('email.admin.generic', $data);
    }

    /**
     * Get the array representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function toArray($notifiable)
    {
        return [
            //
        ];
    }

    public function toSlack($notifiable)
    {
    }
}