Обработка callback от Cбера как дополнительный инструмент подтверждения оплаты

<?
require($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/prolog_before.php");


file_put_contents($_SERVER["DOCUMENT_ROOT"] . "/callback/callback.log", PHP_EOL . 'log start - '. date("d/m/Y") .' в '. date("H:i:s"). PHP_EOL, FILE_APPEND);
foreach ($_GET as $key => $value) {
    file_put_contents($_SERVER["DOCUMENT_ROOT"] . "/callback/callback.log", $key . ' - ' . $value . PHP_EOL, FILE_APPEND);
}
$status =  500;

if($_GET['status'] == 1) {
    $order_id = explode('_',$_GET['orderNumber'])[0];
    $arOrder = CSaleOrder::GetByID($order_id);
    $sberNumber = $_GET['mdOrder'];
    $sberOperation = $_GET['operation'];
    $arOrderFields = array('NUM_SBER' => $sberNumber);

    if ($sberOperation == 'approved' || $sberOperation == 'deposited') {
        // Статус заказа
        CSaleOrder::StatusOrder($order_id, 'P');
        CSaleOrder::PayOrder($order_id, "Y", true, true);
        CSaleOrder::DeliverOrder($order_id, "Y");
        AddOrderProperty(21, $sberNumber, $order_id);
        AddOrderProperty(23, strtoupper($sberOperation), $order_id);
        CSaleOrder::Update($order_id, $arOrderFields);
        file_put_contents($_SERVER["DOCUMENT_ROOT"] . "/callback/callback.log", PHP_EOL . 'Заказ '.$order_id . ' - ' . $sberOperation . PHP_EOL, FILE_APPEND);

    }
    $status = 200;
}

file_put_contents($_SERVER["DOCUMENT_ROOT"] . "/callback/callback.log", PHP_EOL . 'log finish' . PHP_EOL, FILE_APPEND);

http_response_code($status);