public function mergePresentations($presentationsList = array(), $storageName = '', $folder = '')
    {
        if (!is_array($presentationsList) || empty($presentationsList))
            throw new Exception('Presentation list not speciefied');


        $strURI = Product::$baseProductUri . '/slides/' . $this->getFileName() . '/merge';
        if ($folder != '') {
            $strURI .= '?folder=' . $folder;
        }

        if ($storageName != '') {
            $strURI .= '&storage=' . $storageName;
        }
        $signedURI = Utils::sign($strURI);

        $json_data = json_encode($presentationsList);

        $responseStream = Utils::processCommand($signedURI, 'PUT', 'json', $json_data);

        $json = json_decode($responseStream);

        if ($json->Code == 200)
            return $json->Document;
        else
            return false;
    }