public function handleAddToWishlistRedirectOnLogin() {
        global $usces;

        // we have to do this because the hook is called before cookie is set. {@see usceshop.class.php LINE 3797}
        $usces->set_cookie($usces->get_cookie());

        if (!empty($_POST[self::REDIRECT_KEY_ADD_TO_WISHLIST])) {
            $paramstring = urldecode((string)$_POST[self::REDIRECT_KEY_ADD_TO_WISHLIST]);
            parse_str($paramstring, $item);
            $backuppost = $_POST;
            foreach ($item as $key => $val) {
                $_POST[$key] = $val;
            }
            $added = (new API\Item($this->master))->addToWishlist(
                $item['postId'],
                $item['sku'],
                isset($item['itemOption']) ? $item['itemOption'] : [],
                isset($item['advance']) ? $item['advance'] : ''
            );
            foreach ($item as $key => $val) {
                if (isset($backuppost[$key])) {
                    $_POST[$key] = $backuppost[$key];
                } else {
                    unset($_POST[$key]);
                }
            }
            if ($added !== true) {
                return;
            }
            wp_safe_redirect(WCEXWL_PAGE_URL);
            exit;
        } elseif (!empty($_POST[self::REDIRECT_KEY_ADD_TO_WISHLIST_BY_SERIAL])) {
            $cart = isset($_SESSION['usces_cart']) ? $_SESSION['usces_cart'] : [];
            $serials = (array)$_POST[self::REDIRECT_KEY_ADD_TO_WISHLIST_BY_SERIAL];
            $cartapi = new API\Cart($this->master);
            $erroroccured = false;
            foreach ($serials as $encodedserial) {
                $serial = urldecode($encodedserial);
                $advance = isset($cart[$serial]['advance']) ? $cart[$serial]['advance'] : '';
                $added = $cartapi->addToWishlistBySerial($serial, $advance);
                if ($added !== true) {
                    $erroroccured = true;
                }
            }
            if ($erroroccured === true) {
                return;
            }
            wp_safe_redirect(WCEXWL_PAGE_URL);
            exit;
        }
    }