public function getPageHTML()
 {
     // page object
     include_once 'Services/Payment/classes/class.ilShopPage.php';
     include_once 'Services/Payment/classes/class.ilShopPageGUI.php';
     // if page does not exist, return nothing
     if (!ilShopPage::_exists('shop', self::SHOP_PAGE_EDITOR_PAGE_ID)) {
         return '';
     }
     include_once 'Services/Style/classes/class.ilObjStyleSheet.php';
     $this->tpl->setVariable('LOCATION_CONTENT_STYLESHEET', ilObjStyleSheet::getContentStylePath(0));
     // get page object
     $page_gui = new ilShopPageGUI(self::SHOP_PAGE_EDITOR_PAGE_ID);
     return $page_gui->showPage();
 }
 private function __getAbstractHTML($a_payment_object_id)
 {
     // page object
     include_once 'Services/Payment/classes/class.ilShopPage.php';
     include_once 'Services/Payment/classes/class.ilShopPageGUI.php';
     // if page does not exist, return nothing
     if (!ilShopPage::_exists('shop', $a_payment_object_id)) {
         return '';
     }
     include_once 'Services/Style/classes/class.ilObjStyleSheet.php';
     // get page object
     $page_gui = new ilShopPageGUI($a_payment_object_id);
     return $page_gui->showPage();
 }