POST响应中的Uber-API Access_Token现在似乎比以前更长，如何使用C＃检索实际的Access_Token？

Question

当尝试使用v2中的刷新令牌尝试获取新的访问令牌时，我现在收到一个非常长的令牌，看起来像某种加密密钥。最初，它只是一个与refresh_token几乎相同长度的直接access_token。现在这是在代表客户发送优步请求时使用的新access_token吗？或者我如何检索我应该在我的优步请求中使用的实际access_token，即曾经与刷新令牌几乎相同的那个。

下面是我使用Postman的回复的截图。

POSTMAN Screenshot

以下是调用access_token的C＃sourcecode片段方法。

        public async Task WebServerAsyncRefresh(string clientId, string clientSecret, string redirectUri, string RefreshToken)
    {
        if (string.IsNullOrEmpty(clientId)) throw new ArgumentNullException("clientId");
        if (string.IsNullOrEmpty(clientSecret)) throw new ArgumentNullException("clientSecret");
        if (string.IsNullOrEmpty(redirectUri)) throw new ArgumentNullException("redirectUri");
        if (string.IsNullOrEmpty(RefreshToken)) throw new ArgumentNullException("refreshToken");
        if (!Common.IsValidUri(redirectUri)) throw new ArgumentException("Invalid redirectUri");

        var content = new FormUrlEncodedContent(new[]
            {
                new KeyValuePair<string, string>("grant_type", "refresh_token"),
                new KeyValuePair<string, string>("client_id", clientId),
                new KeyValuePair<string, string>("client_secret", clientSecret),
                new KeyValuePair<string, string>("redirect_uri", redirectUri),
                new KeyValuePair<string, string>("refresh_token", RefreshToken)
            });

        var request = new HttpRequestMessage()
        {
            Method = HttpMethod.Post,
            RequestUri = new Uri(TokenUrl),
            Content = content
        };

        var responseMessage = await _httpClient.SendAsync(request).ConfigureAwait(false);
        var response = await responseMessage.Content.ReadAsStringAsync().ConfigureAwait(false);

        if (responseMessage.IsSuccessStatusCode)
        {
            var authToken = JsonConvert.DeserializeObject<AuthToken>(response);

            AccessToken = authToken.access_token;
            RefreshToken = authToken.refresh_token;
        }
        else
        {
            //TODO: Create appropriate error response
            //var errorResponse = JsonConvert.DeserializeObject<AuthErrorResponse>(response);
            //throw new ForceAuthException(errorResponse.error, errorResponse.error_description);
            throw new Exception("error");
        }
    }