Google refresh token getting invalid grant error

Question

I'm trying to use google analytics api for my account. So at first i allow the application access with offline refresh token. Buy when I try to refresh the token I get "Invalid Grant" error. Tried to refresh both with the php client library and manually with curl.

this is manually with curl:

$oauth2token_url = "https://accounts.google.com/o/oauth2/token";
    $clienttoken_post = array(
    "client_id" => 'xxxxxxxx-d28qutrse5bvaf7n4a37qgs5ieijvp9n.apps.googleusercontent.com',
    "client_secret" => 'xxxxxxxxxxxxx');

        $clienttoken_post["refresh_token"] = $refresh_token;
        $clienttoken_post["grant_type"] = "refresh_token";

    $curl = curl_init($oauth2token_url);

    curl_setopt($curl, CURLOPT_POST, true);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $clienttoken_post);
    curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

    $json_response = curl_exec($curl);
    curl_close($curl);

    $authObj = json_decode($json_response);

    print_r($authObj);


    exit();

the refresh token i got with a previous call using the simple.php example:

require_once '../../src/apiClient.php';
require_once '../../src/contrib/apiAnalyticsService.php';
session_start();

$client = new apiClient();
$client->setApplicationName("Google Analytics PHP Starter Application");

// Visit https://code.google.com/apis/console?api=analytics to generate your
// client id, client secret, and to register your redirect uri.
 $client->setClientId('xxxxxxxxx-d28qutrse5bvaf7n4a37qgs5ieijvp9n.apps.googleusercontent.com');
 $client->setClientSecret('xxxxxx');
 $client->setRedirectUri('https://www.xxxxxxxxxx.org/oauth2callback/google-api-php-client/examples/analytics/simple.php');
 $client->setDeveloperKey('xxxxxxx');



if (isset($_GET['logout'])) {
  unset($_SESSION['token']);
}

if (isset($_GET['code'])) {
  $client->authenticate();
  $_SESSION['token'] = $client->getAccessToken();
  header('Location: http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF']);
}

if (isset($_SESSION['token'])) {
//    echo $_SESSION['token'];
  $client->setAccessToken($_SESSION['token']);
}
echo $client->getAccessToken()

Answer 1

if anyone is interested i finally solved it after a few hours:

I went to oauth playground: https://code.google.com/oauthplayground in the right, there is a settings button. selected "Use your own OAuth credentials". took the refresh token from there, and it works with no problem.