что не так, когда я хочу получить Exchange-токен обновления для ID-токена или access_token?

Question

Запрос:

curl_setopt($ch,CURLOPT_URL,"https://securetoken.googleapis.com/v1/token?key=AIzaSyBtSpn3NQEztoJW5q7S6jSBeQSDlZ0gAEE");
  curl_setopt($ch,CURLOPT_RETURNTRANSFER, 1);

  $headers=array();
  $headers[]="Content-Type: application/x-www-form-urlencoded";

  curl_setopt($ch,CURLOPT_HTTPHEADER,$headers);
  curl_setopt($ch,CURLOPT_POST, 1);
  curl_setopt($ch,CURLOPT_POSTFIELDS,"grant_type = refresh_token & refresh_token =".$refresh_token);
  $result = curl_exec($ch);
    curl_close($ch);

    if ($result == null) {
        continue;
    } else {
        return $result;
        break;
    }
}
}

Ответ:

stdClass Object
(
    [error] => stdClass Object
        (
            [code] => 403
            [message] => Requests from this Android client application <empty> are blocked.
            [status] => PERMISSION_DENIED
            [details] => Array
                (
                    [0] => stdClass Object
                        (
                            [@type] => type.googleapis.com/google.rpc.Help
                            [links] => Array
                                (
                                    [0] => stdClass Object
                                        (
                                            [description] => Google developer console API key
                                            [url] => https://console.developers.google.com/project/1087008891043/apiui/credential
                                        )

                                )

                        )

                )

        )

)