如何有效刷新 Google API 客户端访问令牌以避免'invalid_grant”错误？

// Retrieve the original token.
$originalToken = json_decode($token);

// Calculate token expiration time.
$now = time();
$expirationTime = $originalToken->created + 3600;

// Check if token is expired.
if ($now > $expirationTime) {
    // If expired, use the refresh token from the original token to obtain a new temporary token.
    $client->refreshToken($originalToken->refresh_token);
    $newToken = $client->getAccessToken();
    $tokenQuery = "UPDATE token SET token='$newToken' WHERE type='refresh'";
    mysqli_query($cxn, $tokenQuery);
    $token = $newToken;
} else {
    // If the original token hasn't expired, set the token as the original token.
    $client->setAccessToken($token);
}