<?php
class RRShopCheckoutControllerExtension extends DataExtension {
    public function updateCheckoutForm($form) {
        $text = ShopConfig::current_shop_config()->DSGVOCheckoutText;
        if ($text) {
            $fields = $form->Fields();
            $validator = $form->getValidator();
            $fields->push(CheckboxField::create('DSGVO', $text));
            $validator->addRequiredField('DSGVO');
        }
    }
}