How to Resolve 'invalid_grant' Errors When Refreshing Tokens with the Google Analytics API?

Refreshing Token with Google API Client

In utilizing the Google Analytics API (V3), users may encounter errors, particularly when attempting to retrieve data from accounts other than their testing account. This issue typically manifests as a 403 error. Additionally, even after revoking and re-authenticating the token, the problem may resurface upon token expiration.

To address this issue, the solution lies in utilizing the refreshToken method to obtain a new authentication token. However, executing $client->refreshToken(refresh_token_key) may produce an invalid grant error message ("error" : "invalid_grant").

Upon investigating the code behind the refreshToken method, it becomes apparent that the following parameters are sent correctly:

• client_id
• client_secret
• refresh_token
• grant_type (hard-coded as refresh_token)

The procedure for token refreshing is as follows:

$client = new apiClient();
$client->setClientId($config['oauth2_client_id']);
$client->setClientSecret($config['oauth2_client_secret']);
$client->setRedirectUri($config['oauth2_redirect_uri']);
$client->setScopes('https://www.googleapis.com/auth/analytics.readonly');
$client->setState('offline');

$client->setAccessToken($config['token']); // The access JSON object.

$client->refreshToken($config['refreshToken']); // Will return error here

The key to resolving the issue is the understanding that this initial token obtained upon authentication possesses a refresh token. While the initial token expires within an hour, the refresh token can be leveraged to obtain a new token. However, it's crucial to note that this temporary token also expires after an hour and does not have an associated refresh token. Therefore, to retrieve a new temporary token, the initial token's refresh token must be used.

For clarity, the following code provides a detailed explanation:

// Retrieve original token from database
$tokenquery = "SELECT * FROM token WHERE type='original'";
$tokenresult = mysqli_query($cxn, $tokenquery);
if ($tokenresult != 0) {
    $tokenrow = mysqli_fetch_array($tokenresult);
    extract($tokenrow);
}
$time_created = json_decode($token)->created;
$t = time();
$timediff = $t - $time_created;

$refreshToken = json_decode($token)->refresh_token;

// Initialize Google client
$client = new Google_Client();
$client->setApplicationName('');
$client->setScopes(array());
$client->setClientId('');
$client->setClientSecret('');
$client->setRedirectUri('');
$client->setAccessType('offline');
$client->setDeveloperKey('');

// Refresh token if expired
if (($timediff > 3600) && ($token != '')) {
    $refreshquery = "SELECT * FROM token WHERE type='refresh'";
    $refreshresult = mysqli_query($cxn, $refreshquery);

    // If refresh token exists
    if ($refreshresult != 0) {
        $refreshrow = mysqli_fetch_array($refreshresult);
        extract($refreshrow);
        $refresh_created = json_decode($token)->created;
        $refreshtimediff = $t - $refresh_created;

        // If refresh token is also expired
        if ($refreshtimediff > 3600) {
            $client->refreshToken($refreshToken);
            $newtoken = $client->getAccessToken();
            $tokenupdate = "UPDATE token SET token='$newtoken' WHERE type='refresh'";
            mysqli_query($cxn, $tokenupdate);
            $token = $newtoken;
            echo "refreshed again";
        } else {
            $client->setAccessToken($token);
            echo "use refreshed token but not time yet";
        }
    } else {
        $client->refreshToken($refreshToken);
        $newtoken = $client->getAccessToken();
        $tokenupdate = "INSERT INTO token (type, token) VALUES ('refresh', '$newtoken')";
        mysqli_query($cxn, $tokenupdate);
        $token = $newtoken;
        echo "refreshed for first time";
    }
}

// If token is still valid
if (($timediff < 3600) && ($token != '')) {
    $client->setAccessToken($token);
}

$service = new Google_DfareportingService($client);

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