Example PHP script to check fraud status on a sale.

gistfile1.php

<?php

    if ($_POST['message_type'] == 'FRAUD_STATUS_CHANGED') {

        $insMessage = array();
        foreach ($_POST as $k => $v) {
        $insMessage[$k] = $v;
        }

        $hashSecretWord = "tango"; # Input your secret word
        $hashSid = 1303908; #Input your seller ID (2Checkout account number)
        $hashOrder = $insMessage['sale_id'];
        $hashInvoice = $insMessage['invoice_id'];
        $StringToHash = strtoupper(md5($hashOrder . $hashSid . $hashInvoice . $hashSecretWord));

        if ($StringToHash != $insMessage['md5_hash']) {
            die('Hash Incorrect');
        }

        switch ($insMessage['fraud_status']) {
            case 'pass':
                # Do something when sale passes fraud review.
                break;
            case 'fail':
                # Do something when sale fails fraud review.
                break;
            case 'wait':
                # Do something when sale requires additional fraud review.
                break;
        }
    }       

?>