public function returnClientErrorResponse(Zend_Http_Response $response)
    {
        $status = $response->getStatus();
        switch ($status) {
            case 401:
                $message = self::INVALID_API_KEY;
                break;
            case 403:
                $message = self::INVALID_STORE_ID;
                break;
            case 408:
                $message = self::NETWORK_TIMEOUT;
                break;
            default:
                $message = self::UNKNOWN_FAILURE;
                break;
        }
        return array(
            'message' => Mage::helper('radial_core')->__($message), 'success' => false
        );
    }