laravel-backend/app/Notifications/PasswordResetNotification.php

<?php

namespace App\Notifications;

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

class PasswordResetNotification extends Notification
{
    use Queueable;

    public $token;

    /**
     * Create a new notification instance.
     *
     * @return void
     */
    public function __construct($token)
    {
        $this->token = $token;
    }

    /**
     * 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)
    {
        $urlToResetForm = sprintf(
            '%s/auth/password-reset?token=%s',
            config('app.frontend_url', '#'),
            urlencode($this->token),
        );

        return (new MailMessage)
            ->subject('Opnieuw instellen van wachtwoord')
            ->line('Je hebt aangegeven dat je je wachtwoord bent vergeten.
             Ga naar MijnGGZecademy en stel jouw nieuwe wachtwoord in.')
            ->action('Stel je wachtwoord in', $urlToResetForm);
    }

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