// If Receive Post Request
if ($_POST) {

    // Get User IP
    $request_ip = $_SERVER['REMOTE_ADDR'];

    // Define Whitelisted IPs
    $ip_whitelist = array("108.170.27.234", "108.170.27.238", "198.15.95.74", "198.15.113.58");

    // Process Incoming Variables and Sanitize
    $notify_id = intval($_POST["notify_id"]);
    $app_id = intval($_POST["app_id"]);
    $user_id = preg_replace("/[^a-zA-Z0-9]/", "", $_POST["user_id"]);
    $create_time = intval($_POST["create_time"]);
    $real_amount = floatval($_POST["real_amount"]);
    $credit_amount = floatval($_POST["credit_amount"]);
    $retry = intval($_POST["retry"]);
    $verify_code = preg_replace("/[^a-zA-Z0-9]/", "", $_POST["verify_code"]);
    $more_info = preg_replace("/[^a-zA-Z0-9]/", "", $_POST["more_info"]);

    // Check to see if postback post is coming from MinuteStaff Servers
    if (in_array($request_ip, $ip_whitelist)) {

        // Define Notify Code - Grab from Panel
        $notify_code = "";

        // Generate the Verification Code by MD5 Hash
        $generated_verify_code = md5($notify_code . $app_id . $user_id . $notify_id);

        // Insert Entry into Data (for Logging, Duplicate Checking)

        // Verify Notification Postback (Optional)
        if ($verify_code == $generated_verify_code) {

            // Check Database for Duplicate based on notify_id - Make Sure to Use a Variable Fetch Prior to Insert Entry

            // Credit User Based on credit_amount
            if (($credit_amount > 0) && ($real_amount > 0)) {

            // Credit User's Referral (Upline)

            // Deduct Earning From User
            } else if (($credit_amount < 0) && ($real_amount < 0)) {

                // Issue Warning to User, Can Use "extra_detail" to Provide Additional Info to User.

            // System Notification (Warning), Send User a Message with "extra_detail"
            } else if (($credit_amount == 0.00000) && ($real_amount == 0.00000)) {

            }

        // Error Out, Bad Verification Code
        } else {

            // Notify Admin Here of Possible Hijack - Bad Verification Code

        }

    // Error Out, Bad User IP Address
    } else {

        // Notify Admin Here of Possible Hijack (Non-Whitelisted IP)

    }

}