protected static function _addChainedResponse($response)
    {
        $firstChainedMethodName = key($response);

        if (isset(self::$returnValues[$firstChainedMethodName])) {
            self::$returnValues[$firstChainedMethodName] = array_replace_recursive(
                self::$returnValues[$firstChainedMethodName],
                $response[$firstChainedMethodName]
            );
        } else {
            self::$returnValues[$firstChainedMethodName] = $response[$firstChainedMethodName];
        }
    }