Yandex.Checkout and Bitrix, how to connect?

Question

1C-Bitrix

The site has a checkout.
all come true and fighting.
payment does not go through.
tech support response:
Payment failed because your store returned an empty response to checkOrder.
Make sure there are no spaces or invalid characters in the query response template.
Log:
[2020-01-20T22:33:37.284+03:00] INFO [int-ssl-services19] [POST/layout_sevices/shop_info/paymentApproval] [22ed1dcd4ca0c1c6] [] [CommonHttpClient] sendHttpRequest(): requestData=orderNumber= 574
orderSumAmount=192.00
shopArticleId=1647882
cms_name=1C-Bitrix
paymentPayerCode=42000400000002
cdd_rrn=002019067501
paymentType=AC
requestDatetime=2020-01-20T22:33:37.283+03:00
RU =
cps_user_country_code cdd_response_code = 00
orderCreatedDatetime = 2020-01-20T22: 33: 22.286 + 03: 00
action = checkOrder
BX_HANDLER = YANDEX
shopId = 658,273
scid = 1308579
shopSumBankPaycash = 1001
BuyButton = Pay
shopSumCurrencyPaycash = 643
rebillingOn = false
orderSumBankPaycash = 1001
orderSumCurrencyPaycash = 643
unilabel = 25b81429-000f-5000-8000-10ecf6950174
cdd_pan_mask = 427638 | 3627
customerNumber = 1
environment = Live
InvoiceID = 2002241710576
cdd_auth_code = 208938
BX_PAYSYSTEM_CODE = 10
shopSumAmount = 185.28 the
md5 = ECB6650EAFC1317B76685682F5830DA4
[2020-01-20T22:33:37.426+03:00] INFO [int-ssl-services19] [POST/layout_sevices/shop_info/paymentApproval] [22ed1dcd4ca0c1c6] [] [CommonHTTPSCAConnector] 141 ms for https://www.zolotoygus .ru/bitrix/tools/sale_ps_res...
[2020-01-20T22:33:37.426+03:00] WARN [int-ssl-services19] [POST/layout_sevices/shop_info/paymentApproval] [22ed1dcd4ca0c1c6] [] [CommonHttpClient ] Response is not XML: response=
In this situation, funds were sent to the client's bank for a refund.
file /bitrix/tools/sale_ps_result.php looks like:

<?
use \Bitrix\Main\Application;
use \Bitrix\Sale\PaySystem;

define("STOP_STATISTICS", true);
define('NO_AGENT_CHECK', true);
define('NOT_CHECK_PERMISSIONS', true);
define("DisableEventsCheck", true);
require($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/prolog_before.php");

global $APPLICATION;

if (CModule::IncludeModule("sale"))
{
  $context = Application::getInstance()->getContext();
  $request = $context->getRequest();

  $item = PaySystem\Manager::searchByRequest($request);
  if ($item !== false)
  {
    $service = new PaySystem\Service($item);
    if ($service instanceof PaySystem\Service)
      $result = $service->processRequest($request);
  }
}

$APPLICATION->FinalActions();
die();

does anyone have working examples of files
bitrix/tools/sale_ps_fail.php
bitrix/tools/sale_ps_success.php
bitrix/tools/sale_ps_result.php
or is the problem something else?
thanks in advance for the tips.