public function makeJSvars() {
        $furigana_required = false;
        $name3 = '';
        $name4 = '';
        if (usces_have_shipped() === true) {
            $del = $_SESSION['usces_entry']['delivery'];
            if (strtoupper($del['country']) === 'JP') {
                $furigana_required = true;
                $name3 = isset($del['name3']) ? $del['name3'] : '';
                $name4 = isset($del['name4']) ? $del['name4'] : '';
            }
        }
        $vars = array_merge(
            Generic\WelcartUtils::makeJSvars(),
            $this->module->getScriptInjectionVars(),
            [
                'amountZero' => $_SESSION['usces_entry']['order']['total_full_price'] <= 0,
                'backButtonText' => __('Back to payment method page.', 'usces'),
                'extraNamesRequired' => $furigana_required === true && (empty($name3) || empty($name4)),
            ]
        );

        return $vars;
    }