public function actionExpressCheckoutFromDetailsPage()
    {
        $validator = $this->getValidator();
        $currentArticle = $this->getCurrentArticle();
        $validator->setItemToValidate($currentArticle);
        $validator->setBasket($this->getSession()->getBasket());
        if ($validator->isArticleValid()) {
            //Make express checkout
            $res = $this->actionAddToBasketAndGoToCheckout();
        } else {
            $res = $this->_getRedirectUrl();
            //if amount is more than 0, do not redirect, show ESC popup instead
            if ($currentArticle->getArticleAmount() > 0) {
                $this->shopPopUp = true;
                $res = null;
            }
        }

        return $res;
    }