ลูกค้าซื้อเครดิตกับเว็บไซต์ เพื่อขอข้อมูลสมาชิก เราจะตัดเครดิตของลูกค้ายังไงค่ะ รายละเอียดด้านใน

$organize_id=$_POST['organize_id'];
$exhibiter_id=$_POST['exhibiter_id'];
$reserve_ID=$_POST['reserve_ID'];
$reserve_Title =$_POST['reserve_Title '];
$exhibiter_name=$_POST['exhibiter_name'];
$exhibiter_email=$_POST['exhibiter_email'];
$exhibiter_company=$_POST['exhibiter_company'];
$exhibiter_address=$_POST['exhibiter_address'];
$exhibiter_tel=$_POST['exhibiter_tel'];
$exhibiter_business=$_POST['exhibiter_business'];
$text=$_POST['text'];

 $sql = "select * from tb_exhibiter_booking where exhibiter_id ='$exhibiter_id' AND reserve_ID='$reserve_ID'";
$dbquery = mysql_query($sql) or die ("sql ผิดพลาด");
$num_rows=mysql_num_rows($dbquery); 
if ($num_rows == 0)

	{
		$sql = "insert into tb_exhibiter_booking (exhibiter_id,exhibiter_name,reserve_ID,organize_id,exhibiter_email,exhibiter_company,exhibiter_address,exhibiter_tel,exhibiter_business,text,date)";
		$sql.= "values ('$exhibiter_id','$exhibiter_name','$reserve_ID','$organize_id','$exhibiter_email','$exhibiter_company','$exhibiter_address','$exhibiter_tel','$exhibiter_business','$text',now())";			
mysql_query($sql) or die ("ไม่สามารถเพิ่มข้อมูลได้");  
 mysql_close();
//echo "<meta http-equiv=\"refresh\"content=\"0;URL=user_show.php\">";	
	}
else
{
echo "E-mail นี้มีอยู่ในระบบแล้วค่ะ";
//echo  "<meta http-equiv=\"refresh\"content=\"1;URL=user_addnew.php\">";	
}