Sanal pos ödemeyi bazen kullanıcı bakiyesine aktarmıyor.

<?php    if(!isset($_SESSION['user_login'])) {        redirect('index');    }
    if($_POST) {        $open = fopen($_SERVER['DOCUMENT_ROOT'] . '/log/' . time() . '.txt', 'a+');                fwrite($open, print_r($_POST, true));                fclose($open);
        if($_POST['STATUS'] == 'SUCCESS') {            $ref     = $_POST['ORDER_REF_NUMBER'];            $query   = $_sql->S("*", "payments as p")->J("amount_list as a")->W("p.payment_id = '{$ref}' AND a.amount = p.payment_amount")->R();            $query   = $query[0];                        # update user            $up  = $_sql->U("user", "user_balance = user_balance + {$query['balance']}")->W("user_id = '{$query['user_id']}'")->R();            $up2 = $_sql->U("payments", "payment_confirm = '1'")->W("payment_id = '{$ref}'")->R();
            if($up['status'] == 'ok') {                echo "Ödeme başarılı. <a href='/'>Ana sayfaya dön</a>";
                $_SESSION['user_balance'] = $_SESSION['user_balance'] + $query['balance'];            } else {                echo "Bir hata oluştu. Lütfen yönetici ile iletişime geçiniz. <a href='/iletisim'>İletişim sayfası</a>";            }        } else {            echo "Hatalı işlem. <a href='/'>Ana sayfa</a></br>". $_POST['RETURN_MESSAGE'];        }    } else {        echo "Hatalı işlem. <a href='/'>Ana sayfa</a>";    }?>

<?php    function get_content($url, $post) {        $curl = curl_init();                curl_setopt( $curl, CURLOPT_URL , $url);                curl_setopt( $curl, CURLOPT_RETURNTRANSFER , true);                curl_setopt( $curl, CURLOPT_FOLLOWLOCATION , true);                curl_setopt( $curl, CURLOPT_POST , true);                curl_setopt( $curl, CURLOPT_POSTFIELDS , $post);                curl_setopt( $curl, CURLOPT_USERAGENT , $_SERVER['HTTP_USER_AGENT']);                curl_setopt( $curl, CURLOPT_REFERER   , $url);                curl_setopt( $curl, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));        $exec = curl_exec($curl);                curl_close($curl);
                if( $strip ):                    return str_replace(array("\n","\t","\r"), NULL, $exec);                else:                    return $exec;                endif;    }
    if($_POST['pay']) {        if(isset($_SESSION['user_id']) && is_numeric($_SESSION['user_id'])) {            $amount = post('amount');            $user   = $_SESSION['user_id'];            $cardno = post('cardno');            $expm   = post('expm');            $expy   = post('expy');            $sec    = post('sec');            $owner  = post('cardowner');            $empty  = is_empty($amount, $user, $cardno, $expm, $expy, $sec, $owner);            $uinfo  = $_sql->S("*", "user")->W("user_id = '{$user}'")->R();            $uinfo  = $uinfo[0];            $expnam = explode(" ", $uinfo['user_name']);            $surnam = end($expnam);            $name   = str_replace($surnam, "", $uinfo['user_name']);
            if($empty) {                $json = "                    {                        \"Config\" :  {                            \"MERCHANT\" : \"TEST1234\",                            \"MERCHANT_KEY\" : \"4oK26hK8MOXrIV1bzTRVPA==\",                            \"BACK_URL\" : \"http://kirbacyarisgazetesi.com\",                            \"PRICES_CURRENCY\" : \"TR\",                            \"ORDER_REF_NUMBER\" : \"001\",                            \"ORDER_AMOUNT\" : \"{$amount}\"                        },                        \"CreditCard\" : {                             \"CC_NUMBER\" : \"{$cardno}\",                             \"EXP_MONTH\" : \"{$expm}\",                             \"EXP_YEAR\" : \"{$expy}\",                             \"CC_CVV\" : \"{$sec}\",                             \"CC_OWNER\" : \"{$owner}\",                             \"INSTALLMENT_NUMBER\" : \"1\"                        },                        \"Customer\" : {                             \"FIRST_NAME\" : \"{$name}\",                             \"LAST_NAME\" : \"{$surnam}\",                             \"MAIL\" : \"{$uinfo['user_mail']}\",                             \"PHONE\" : \"{$uinfo['user_phone']}\",                             \"CITY\" : \"İstanbul\",                             \"STATE\" : \"Şişli\",                             \"ADDRESS\" : \"Merkez Mah. Bomonti Şişli/İstanbul\"                        }                    }                ";

                echo get_content("https://posservice.elekse.com/api/pay/EYV3DPay", $json). "---";            }        }    }?>

<?php    if($_POST) {        $open = fopen('notify_post.txt', 'a+');              
 fwrite($open, var_dump($_POST));                fclose($open);    }
    if($_GET) {        $open = fopen('notify_get.txt', 'a+');  
             fwrite($open, var_dump($_GET));  
              fclose($open);    }?>