// Получение корзины для текущего пользователя
                $basket = \Bitrix\Sale\Basket::loadItemsForFUser(
                   \Bitrix\Sale\Fuser::getId(), 
                   $_GET["site_id"]
                );

                if($item = $basket->getExistsItem("catalog", intval($_GET["id"]))){

                   //Обновление товара в корзине
                   $item->setField("QUANTITY", $item->getQuantity() + $addBasketQuantity);

                }

                else{


                    //Добавление товара
                    $rsElement = CIBlockElement::GetByID(intval($_GET["id"]));
                    if($arNextElement = $rsElement->GetNext()){
                        $item = $basket->createItem("catalog", intval($_GET["id"]));
                        $item->setFields([
                            "QUANTITY" => $addBasketQuantity,
                            "CURRENCY" => \Bitrix\Currency\CurrencyManager::getBaseCurrency(),
                            "LID" => $_GET["site_id"],
                            "PRODUCT_PROVIDER_CLASS" => "CCatalogProductProvider",//changed for OPT price in basket//Bitrix\Catalog\Product\CatalogProvider",
                            "CATALOG_XML_ID" => $arNextElement["IBLOCK_EXTERNAL_ID"],
                            "PRODUCT_XML_ID" => $arNextElement["EXTERNAL_ID"],
                        ]);
                    }

                }

                //Сохранение изменений
                $basket->save();

use \Bitrix\Main\Data\Cache;
// получаем экземпляр класса c конфигурацией cache_config_name
$cache = Cache::createInstance('cache_config_name'); 

'cache' => [
   'value' =>
      [
         'default' => [
            'type' => [
               'class_name' =>
                  '\\Bitrix\\Main\\Data\\CacheEngineFiles'
            ]
         ],
         'cache_config_name' => [
            'type' => [
               'class_name' =>
                  '\\Bitrix\\Main\\Data\\CacheEngineRedis',
               'extension' => 'redis'
            ],
            'redis' => [
               'host' => '127.0.0.1',
               'port' => '6379'
            ]
         ],
         'sid' => $_SERVER["DOCUMENT_ROOT"]."#01"
      ]