private function doPostMultipartFormData($url, $authorization, $paths, $data)
 {
     $boundary = Text::uuid();
     $body = "--{$boundary}\r\n";
     foreach ($data as $key => $value) {
         $body .= "Content-Disposition: form-data; name=\"{$key}\"\r\n";
         $body .= "\r\n";
         $body .= "{$value}\r\n";
         $body .= "--{$boundary}\r\n";
     }
     foreach ($paths as $key => $path) {
         $body .= "Content-Disposition: form-data; name=\"{$key}\"; filename=\"{$path}\"\r\n";
         $body .= "\r\n";
         $body .= file_get_contents($path) . "\r\n";
         $body .= "--{$boundary}--\r\n";
     }
     $socket = new Client();
     $result = $socket->request(array('method' => 'POST', 'uri' => $url, 'header' => array('Authorization' => $authorization, 'Content-Type' => "multipart/form-data; boundary={$boundary}"), 'body' => $body));
     $this->fullResponse = $result;
     return $result;
 }