Google API - 刷新令牌

Question

我試圖在他過期後得到一個新的access_token。我已經在銀行存的回報，我收到信息的第一客戶端訪問：

{"access_token": "TOKEN", "refresh_token": "TOKEN", "token_type", "Bearer", "expires_in": 3600, "created ": 1320790426}

之後令牌到期我需要申請一個新的，我做的是這樣的：

$client = new Google_Client(); 
$client->setApplicationName(APPLICATION_NAME); 
$client->setScopes(SCOPES); 
$client->setAuthConfigFile(CLIENT_SECRET_PATH); 
$client->setAccessType('offline'); 

$token['access_token'] = $db->dados[0]['use_access_token']; 
$token['refresh_token'] = $db->dados[0]['use_refresh_token']; 
$token['token_type'] = $db->dados[0]['use_token_type']; 
$token['expires_in'] = $db->dados[0]['use_expires_in']; 
$token['created']  = $db->dados[0]['use_created']; 

$client->setAccessToken(json_encode($token)); 

if ($client->isAccessTokenExpired()) { 
    echo "Expired !"; 
    $client->refreshToken($client->getRefreshToken()); 
    //$accessToken = $client->authenticate($authCode); 
} else { 
    ... 
} 

問題是，總是返回此錯誤： 錯誤刷新的OAuth2令牌，消息：

{ "error" : "invalid_grant" }

Answer 1

$client->refreshToken($refreshToken); 
    $newtoken=$client->getAccessToken(); 
    echo $newtoken."</br>";