protected function _retrieveLast4DigitsFromReason($reason)
    {
        $result = "";

        if ($reason != "") {
            $reasonArray = explode(":", $reason);
            if ($reasonArray != null && is_array($reasonArray)) {
                if (isset($reasonArray[1])) {
                    $result = $reasonArray[1];
                }
            }
        }

        return $result;
    }