protected function submitAddAddressCheckout()
    {
        $type = $this->getPosted('save_address', '', true, 'string');

        if (empty($type)) {
            return null;
        }

        $errors = $this->validateAddressCheckout($type);

        if (empty($errors)) {
            $this->addAddressCheckout($type);
            $this->{"show_{$type}_address_form"} = false;
        }
    }