private function getOAuthClient($token)
 {
     $api_url = $_ENV['API_URL'] == null ? Client::API_URL : $_ENV['API_URL'];
     $oauth_token_url = $_ENV['OAUTH_TOKEN_URL'] == null ? Client::OAUTH_TOKEN_URL : $_ENV['OAUTH_TOKEN_URL'];
     $oauth_client = new Client($token, null, $api_url, $oauth_token_url);
     // $oauth_client->enableDebugMode();
     if ($api_url != Client::API_URL) {
         $oauth_client->disableCertificateCheck();
     }
     return $oauth_client;
 }