Работаем с Highload инфоблоками Битрикса

// Подключаем классы для работы с higloadblockами
use Bitrix\Highloadblock as HL;
use Bitrix\Main\Entity;
use Bitrix\Main\Type\DateTime;   // Можете не подключать, если не планируете работать с типом дата/время
 
AddEventHandler("sale", "OnSalePayOrder", array("MyClass", "OnSalePayOrderHandler"));  
  
class MyClass
{   
   function OnSalePayOrderHandler($orderID, $val)
   {
      // Если оплата Y
      if($val === 'Y')
      { 
      
         $dbBasketItems = CSaleBasket::GetList(
            array("PRICE" => "DESC"),
            array(
//                  В фильтре следует оставить только ORDER_ID!               
//                  "FUSER_ID" => CSaleBasket::GetBasketUserID(),
//                  "LID" => SITE_ID,
                  "ORDER_ID" => $orderID
               ),
            false,
            false,
            array("ID", "NAME")
            );
                     
         $arItems = array();      
         while ($arBasketItems = $dbBasketItems->Fetch())
         {
         
            // Проверяем является ли товара номером, если да то добавляем номер в хайлоад инфоблок
            $dbProp = CSaleBasket::GetPropsList(array("SORT" => "ASC", "ID" => "ASC"), array("BASKET_ID" => $arBasketItems["ID"], "CODE" => "NUMBER"));
            if($arProp = $dbProp -> GetNext())
            {
               $arBasketItems['PROPS'][$arProp['CODE']] = $arProp;
               $arItems[] = $arBasketItems;
            }
         }

         if(!empty($arItems))
         {
         
            // Подключаем хайлоад инфоблоки                  
            if (!CModule::IncludeModule("highloadblock"))
            {
               ShowError(GetMessage("Модуль highloadblock не установлен."));
               return;
            }
                        
            // Получаем айди пользователя
            
            $rsOrder = CSaleOrder::GetList(array('ID' => 'DESC'), array('ID' => $orderID), false, false, array('ID', 'USER_ID'));
            if($arOrder = $rsOrder->Fetch())
            {
               $userID = $arOrder['USER_ID'];                                             
            }
         
            // Айди нашего хайлоад блока
            $hlblock_id = 1;
            
            $hlblock = HL\HighloadBlockTable::getById($hlblock_id)->fetch();
            
            if (empty($hlblock))
            {
               ShowError('404');
               return;
            }
            
            $entity = HL\HighloadBlockTable::compileEntity($hlblock);
            $entity_data_class = $entity->getDataClass();
            
            $f = fopen ($_SERVER['DOCUMENT_ROOT']."/bitrix/numbers_log.txt", "a+");      
            
            foreach ($arItems as $arItem)
            {
               $dt = new DateTime();
               
               $dt90 = new DateTime();
               $dt90->add('+90 days');
                                       
               $result = $entity_data_class::add(
                  array(
                           'UF_NUMBER' => $arItem['PROPS']['NUMBER']['VALUE'],
                           'UF_USER_ID' => $userID,
                           'UF_DATETIME_PAYED' => $dt,
                           'UF_DATETIME_FINISH' => $dt90,
                        )
                     );
               if ($result->isSuccess()) 
               {         
                  fwrite ($f, 'ДОБАВЛЕН ' . $result->getId() . "\n");         
               }
               else
               { 
                  fwrite ($f, 'ОШИБКА ' . implode(', ', $result->getErrors()) . "\n");
               }                           
            }            
            fclose($f);
         }
      }
   }
}

global $USER;

if (!CModule::IncludeModule("highloadblock"))
{
   ShowError(GetMessage("Модуль highloadblock не установлен."));
   return;
}

use Bitrix\Highloadblock as HL;
use Bitrix\Main\Entity;

// Айди нашего хайлоад блока
$hlblock_id = 1;
            
$hlblock = HL\HighloadBlockTable::getById($hlblock_id)->fetch();
            
if (empty($hlblock))
{
   ShowError('404');
   return;
}
            
$entity = HL\HighloadBlockTable::compileEntity($hlblock);
$entity_data_class = $entity->getDataClass();

      
$rsData = $entity_data_class::getList(array(
   "select" => array("*"),
   "order" => array("ID" => "ASC"),
   "filter" => array('UF_USER_ID' => $USER->GetID())
));

while($arData = $rsData->Fetch())
{
   $arResult[] = $arData;   
}