$client = new Google_Client(); $client->setAccessToken($access_token);
$client = new Google_Client(); $token = $client->fetchAccessTokenWithAuthCode($auth_code); $client->setAccessToken($token);In this example, the `fetchAccessTokenWithAuthCode` method is used to obtain the access token by passing the authorization code returned from the OAuth2 authentication process. Then, the `setAccessToken` method is used to set the acquired access token for the Google API client object. This method belongs to the package "google/apiclient": "2.0" and above.