private function sendResponse($token, $to, $message)
{
$url = sprintf('%s/conversations/%s/activities/', SKYPE_API_URL, $to);
$headers = ['Authorization: Bearer ' . $token];
//echo "<pre>" . htmlentities(json_encode(json_decode($message), JSON_PRETTY_PRINT)) . "</pre>";
$response = CurlUtils::post($url, $message, $headers);
//var_dump($response);
}