protected function removeResultInformation($json) {
        $object = json_decode($json, false);

        if (property_exists($object, 'result_code')) {
            unset($object->result_code);
        }

        if (property_exists($object, 'result_message')) {
            unset($object->result_message);
        }

        if (property_exists($object, 'result_output')) {
            unset($object->result_output);
        }

        return json_encode($object);
    }