Изменение типа цены в корзине

AddEventHandler("catalog", "OnGetOptimalPrice", "MyGetOptimalPrice");
function MyGetOptimalPrice($intProductID, $quantity = 1, $arUserGroups = array(), $renewal = "N", $arPrices = array(), $siteID = false, $arDiscountCoupons = false){

    //if(empty($_SESSION["REGION_PRICE_ID"]))$_SESSION["REGION_PRICE_ID"] = 17;

    //====================================================================================================================================

    if (!CModule::IncludeModule('iblock') or !CModule::IncludeModule('catalog') or !CModule::IncludeModule("sale"))
    {
        die('Ошибка в загрузки модулей...');
    };

    $arResult = array();

    if(!empty($intProductID)) {
        //Проверяем есль ли акционная цена
        $resDiscount = CPrice::GetList(array(), array('PRODUCT_ID' => $intProductID, 'CATALOG_GROUP_ID' => 19));
        if($arPriceDiscount = $resDiscount -> GetNext()){
            $arDiscounts = CCatalogDiscount::GetDiscountByPrice($arPriceDiscount["ID"], $GLOBALS['USER'] -> GetUserGroupArray(), "N", SITE_ID);
            if(!empty($arDiscounts[0])){
                $discountPrice = CCatalogProduct::CountPriceWithDiscount($arPriceDiscount["PRICE"], $arPriceDiscount["CURRENCY"], $arDiscounts);
            }
            $discount = $arPriceDiscount['PRICE'] - $discountPrice;
            $arResult["PRICE"] = $arPriceDiscount['PRICE'];
            $arResult["CATALOG_GROUP_ID"] = $_SESSION["REGION_PRICE_ID"];
            $arResult["CURRENCY"] = $arPriceDiscount['CURRENCY'];
            if($discountPrice){
                $arResult["DISCOUNT_PRICE"] = $discountPrice;
            }
            else{
                $arResult["DISCOUNT_PRICE"] = $arResult["PRICE"];
            }
        }
        else{
            //Если нету, ставим цену МСК
            $res = CPrice::GetList(array(), array('PRODUCT_ID' => $intProductID, 'CATALOG_GROUP_ID' => 20));
            if($arPrice = $res -> GetNext()){
                $arDiscounts = CCatalogDiscount::GetDiscountByPrice($arPrice["ID"], $GLOBALS['USER'] -> GetUserGroupArray(), "N", SITE_ID);
                if(!empty($arDiscounts[0])){
                    $discountPrice = CCatalogProduct::CountPriceWithDiscount($arPrice["PRICE"], $arPrice["CURRENCY"], $arDiscounts);
                }
                $discount = $arPrice['PRICE'] - $discountPrice;
                $arResult["PRICE"] = $arPrice['PRICE'];
                $arResult["CATALOG_GROUP_ID"] = $_SESSION["REGION_PRICE_ID"];
                $arResult["CURRENCY"] = $arPrice['CURRENCY'];
                if($discountPrice){
                    $arResult["DISCOUNT_PRICE"] = $discountPrice;
                }
                else{
                    $arResult["DISCOUNT_PRICE"] = $arResult["PRICE"];
                }
            }
        }
    }


    //file_put_contents($_SERVER['DOCUMENT_ROOT'].'/test-log2.txt', print_r($arResult["DISCOUNT_LIST"],1), FILE_APPEND);

    return array(
        'PRICE' => array(
            'CATALOG_GROUP_ID' => $arResult["CATALOG_GROUP_ID"],
            'PRICE' => $arResult["PRICE"],
            'CURRENCY' => $arResult["CURRENCY"],
        ),
        'RESULT_PRICE' => array(
            'BASE_PRICE' => $arResult["PRICE"],
            'DISCOUNT_PRICE' => $arResult["DISCOUNT_PRICE"],
            'DISCOUNT' => $arResult["PRICE"] - $arResult["DISCOUNT_PRICE"],
            'PERCENT' => ($arResult["PRICE"] > 0 ? roundEx((100*($arResult["PRICE"] - $arResult["DISCOUNT_PRICE"]))/$arResult["PRICE"], CATALOG_VALUE_PRECISION) : 0),
            'CURRENCY' => $arResult["CURRENCY"],
            'VAT_RATE' => false,
            'VAT_INCLUDED' => 'Y'
        ),
        'DISCOUNT_PRICE' => $arResult["DISCOUNT_PRICE"],
        'DISCOUNT_LIST' => $arResult["DISCOUNT_LIST"] // массив скидок действующих на товар в порядке применения
    );


    //====================================================================================================================================
}