WgoingOn

function writeLog($data, $title = 'logs',$file = "/home/bitrix/www/local/apps/sales/app.log")
    {
        $log = "\n------------------------\n";
        $log .= date("Y.m.d G:i:s") . "\n";
        $log .= (strlen($title) > 0 ? $title : 'DEBUG') . "\n";
        $log .= print_r($data, 1);
        $log .= "\n------------------------\n";
        file_put_contents($file, $log, FILE_APPEND);
        return true;
    } 

AddEventHandler("sale", "OnSaleComponentOrderResultPrepared", "onlinePayment");
function onlinePayment($order, &$arUserResult, $request, &$arParams, &$arResult)
{

    
    // order_id 
    $file = "/home/bitrix/www/local/apps/sales/app.log";
 
    
    writeLog($arUserResult,'$user_result',$file); 
    writeLog($arParams,'$params',$file);
    writeLog($arResult,'$result',$file);

    // require_once $_SERVER["DOCUMENT_ROOT"].'/local/apps/sales/onlinePayment.php';
}