Google calendar api 将Google Apps MarketPlace的API从OAuth 1.0升级到OAuth 2.0

我在Google apps marketplace上列出了一个用于日历集成的应用程序。因为它是OAuth 1.0，但现在我正在将我的应用程序迁移到OAuth 2.0。我们在

https://developers.google.com/apps-marketplace/v1migratev2

在这里。但当我遵循这些步骤时，我就得到了401（未经授权）。请检查下面的代码我正在做什么迁移一个域

        String url = String.Format("https://www.googleapis.com/appsmarket/v2/upgradableApp/{0}/{1}/{2}", oldAppId, chromeListing, domain);            
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.Method = "PUT";
        request.Headers.Add("Authorization", "OAuth");
        Hashtable postObj = new Hashtable();
        postObj["Consumer Key"] = oldClientId;
        postObj["Consumer Key Secret"] = oldSecret;
        String s1 = new JavaScriptSerializer().Serialize(postObj);
        var bs = Encoding.UTF8.GetBytes(s1);
        using (Stream reqStream = request.GetRequestStream())
        {
            reqStream.Write(bs, 0, bs.Length);
        }
        String result = "";
        using (WebResponse response = request.GetResponse())
        {
            using (var sr = new StreamReader(response.GetResponseStream()))
            {
                result = sr.ReadToEnd();
                sr.Close();
            }
        }

是否有人知道我们需要如何将旧用户迁移到新应用程序。我已经完成了上面链接中提供的所有步骤。提前谢谢