<?php
    $server = "MyServersIP";
    $user = "MyUser";
    $pass = "MyPassword";
    $db = "MyDB";

    $conn = mysql_connect($server, $user, $pass);

    mysql_select_db($db);

    $Username = mysql_real_escape_string($_GET['Username'], $db);
    $Fuel = mysql_real_escape_string($_GET['Fuel'], $db);
    $IAPCar1 = mysql_real_escape_string($_GET['IAPCar1'], $db);
    $IAPCar2 = mysql_real_escape_string($_GET['IAPCar2'], $db);
    $Score = mysql_real_escape_string($_GET['Score'], $db);
    $Level = mysql_real_escape_string($_GET['Level'], $db);
    $Wins = mysql_real_escape_string($_GET['Wins'], $db);
    $Losses = mysql_real_escape_string($_GET['Losses'], $db);
    $Ads = mysql_real_escape_string($_GET['Ads'], $db);
    $LicensePlate = mysql_real_escape_string($_GET['LicensePlate'], $db);
    $hash = $_GET['hash'];

    $secretKey = "BlItZkRiEg01![SCD];"

    $real_hash = md5($Username . $Fuel . $IAPCar1 . $IAPCar2 . $Score .     $Level . $Wins . $Losses .
    $Ads . $LicensePlate . $hash);
    if ($real_hash == $hash)
    {
        $query = "INSERT INTO Player values (NULL, '$Username', '$Fuel', '$IAPCar1', '$IAPCar2',
        '$Score', '$Level', '$Wins', '$Losses', '$Ads', '$LicensePlate');"
        $result = mysql_query($query);
    }

    mysql_close($conn);
?>

public string setValues = "http://www.mysite.com/Set_Values.php?";
public void SetValues(string username, int fuel, bool iapCar1, bool iapCar2, int score,
    int level, int wins, int losses, bool ads, string licensePlate, bool firstTime)
{
    string hash = Md5Sum(string.Format("{0}{1}{2}{3}{4}{5}{6}{7}{8}{9}", username, fuel, iapCar1, iapCar2,
        score, level, wins, losses, ads, licensePlate, secretKey));
    string url = string.Format("{0}username={1}&fuel={2}&IAPCar1={3}&IAPCar2={4}&Score={5}&Level={6}" +
        "&Wins={7}&Losses={8}&Ads={9}&LicensePlate={10}&FirstTime={11}&hash={12}", setValues, username, fuel, iapCar1, iapCar2,
        score, level, wins, losses, ads, licensePlate, firstTime, secretKey);

    WWW www = new WWW(url);
}