ช่วยดู Code ให้หน่อยครับ ทำไมมันไม่ยอมลง DB ให้ผมอะครับ!

<?php
require_once('AES.php');
require_once('../config.php');

//  ตั่งค่า  API_PASSKEY =  TOPUP_BIG  ให้ตรงกับ TMTOPUP
define('API_PASSKEY', 'TOPUP_BIG');
if($_SERVER['REMOTE_ADDR'] == '203.146.127.115' && isset($_GET['request']))
{
    $aes = new Crypt_AES();
    $aes->setKey(API_PASSKEY);
    $_GET['request'] = base64_decode(strtr($_GET['request'], '-_,', '+/='));
    $_GET['request'] = $aes->decrypt($_GET['request']);
    if($_GET['request'] != false) 
	{
        parse_str($_GET['request'],$request);
        $request['Ref1'] = base64_decode($request['Ref1']);
		$request['cardcard_password'];
		$request['cardcard_amount'];
		$request['client_ip'];
		 // 	INSERT  ข้อมูลที่ถูกส่งกลับมาจาก TMTOPUP ลง DB
		 mysql_connect('bc.msu.ac.th','std52010916585','16585');
         mysql_select_db('std52010916585');
      	$SQL = "INSERT INTO topup";
		$SQL +="(m_id , topup_cardnumber , topup_cardamount , topup_ipclient ) values 
		('.$request['Ref1'].' , '.$request['cardcard_password'].' , '.$request['cardcard_amount'].' , '.$request['client_ip'].')";
		mysql_query($SQL); 
 echo 'SUCCEED';
     }
     else
     {
         echo 'ERROR|INVALID_PASSKEY';
     }
 }
 else
 {
     echo 'ERROR|ACCESS_DENIED';
 } 
?>