$ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $control->_connect_ini['google_url']);
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
        curl_setopt($ch, CURLOPT_HTTPHEADER, $request_headers);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        $response = curl_exec($ch);
        curl_close($ch);

{"multicast_id":5652500584254823832,"success":1,"failure":0,"canonical_ids":0,"results":[{"message_id":"0:1527001372290285%2fd9afcdf9fd7ecd"}]}