Поиск купона по ID пользователя Битрикс

\Bitrix\Main\Loader::includeModule('sale');
\Bitrix\Main\Loader::includeModule('catalog');

$user_id = 100;

$rsCoupon = \Bitrix\Sale\Internals\DiscountCouponTable::getList(array(
	'limit'=>1,
	'filter' => array('MODIFIED_BY'=>$user_id)
));

if($coupon = $rsCoupon->fetch()){
	print_r($coupon);
}