How to get a list of cumulative discounts, as well as the value of a specific user's cumulative discount?

Question

1C-Bitrix

BUS 18, A loyalty program has been created in the "Rules for working with the basket".
This method is probably outdated. The $arResult array is returned empty.

require($_SERVER["DOCUMENT_ROOT"]."/bitrix/header.php");
global $USER;
Bitrix\Main\Loader::includeModule("catalog");
$arResult['DiscountSave'] = CCatalogDiscountSave::GetDiscount(array('USER_ID' => $USER->GetID()));
print_r($arResult);

Are there options to get a list of cumulative discounts and the value of the cumulative discount of an individual user?