domainverification.php

См. документацию.

<?php
define("NOT_CHECK_FILE_PERMISSIONS", true);
require_once($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/prolog_before.php");
 
use Bitrix\Main,
    Bitrix\Sale;
 
if (Main\Loader::includeModule("sale"))
{
    $domainVerification = Sale\Domain\Verification\BaseManager::searchByRequest(
        $_SERVER["SERVER_NAME"],
        $requestUriWithoutParams
    );
 
    if ($domainVerification)
    {
        global $APPLICATION;
        $APPLICATION->restartBuffer();
 
        Sale\Domain\Verification\Service::setEndBufferContentHandler($domainVerification["CONTENT"]);
    }
    else
    {
        \CHTTP::SetStatus("404 Not Found");
    }
}