I need some help with Google API Oauth 2.0

Hello everyone,

I'm trying to pull my list of Google contacts and display on a page the name and phone number.
I found an interesting post made by Lorna Jane and tried her code. I get a token returned, but every time I revisit the page, it asks me to authenticate again. With current code, no data array is pulled:

$id = 'secret.apps.googleusercontent.com';
$scope = 'https://www.google.com/m8/feeds/default/full/';
$uri = 'http://localhost/callback.php';
 
$params = array(
  'response_type'    => 'code',
  'client_id'    => $id,
  'redirect_uri'    => $uri,
  'scope'        => $scope
);
$query = 'https://accounts.google.com/o/oauth2/auth?' . http_build_query($params);
header('Location: ' . filter_var($query, FILTER_SANITIZE_URL));
if (isset($_GET['code']))
{
  $code = $_GET['code'];
  $token = 'https://accounts.google.com/o/oauth2/token';
  $params = array(
      'code'        => $code,
      'client_id'    => $id,
      'client_secret'    => 'clientsecret',
      'redirect_uri'    => $uri,
      'grant_type'    => 'authorization_code'
  );
  $request = new HttpRequest($token, HttpRequest::METH_POST);
  $request->setPostFields($params);
  $request->send();
  $responseObj = json_decode($request->getResponseBody());
  var_dump($responseObj);
}

Code (markup):

Please let me know what I'm missing. I prefer the pecl_http implementation, over the Google API library.