Paypal REST api调用从cURL工作，而不是从C#代码工作

Question

curl https://api.sandbox.paypal.com/v1/oauth2/token -H "Accept: application/json" -H "Accept-Language: en_US" -u "A****:E****" -d "grant_type=client_credentials" 

  HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create("https://api.sandbox.paypal.com/v1/oauth2/token");
  request.Method = "POST";
  request.Accept = "application/json";
  request.Headers.Add("Accept-Language:en_US")

  // this doesn't work:
  **request.Credentials = new NetworkCredential("A****", "E****");**

  // DO THIS INSTEAD
  **string authInfo = Convert.ToBase64String(System.Text.Encoding.Default.GetBytes("A****:E****"));**
  **request.Headers["Authorization"] = "Basic " + authInfo;**

  using (StreamWriter swt = new StreamWriter(request.GetRequestStream()))
  {
    swt.Write("grant_type=client_credentials");
  }

  request.BeginGetResponse((r) =>
  {
    try
    {
       HttpWebResponse response = request.EndGetResponse(r) as HttpWebResponse; // Exception here
       ....
    } catch (Exception x)  { .... } // log the exception - 401 Unauthorized
  }, null);

这是来自Fiddler（原始）捕获的代码的请求，由于某种原因没有授权参数：

POST https://api.sandbox.paypal.com/v1/oauth2/token HTTP/1.1
Accept: application/json
Accept-Language: en_US
Host: api.sandbox.paypal.com
Content-Length: 29
Expect: 100-continue
Connection: Keep-Alive

grant_type=client_credentials

Answer 1

希望下面的代码对任何仍在寻找一块好蛋糕连接到贝宝的人有所帮助。

作为许多人，我已经投入了很多时间试图获得我的贝宝令牌访问没有成功，直到我发现以下：

public class PayPalClient
{
    public async Task RequestPayPalToken() 
    {
        // Discussion about SSL secure channel
        // http://stackoverflow.com/questions/32994464/could-not-create-ssl-tls-secure-channel-despite-setting-servercertificatevalida
        ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, sslPolicyErrors) => true;
        ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

        try
        {
            // ClientId of your Paypal app API
            string APIClientId = "**_[your_API_Client_Id]_**";

            // secret key of you Paypal app API
            string APISecret = "**_[your_API_secret]_**";

            using (var client = new System.Net.Http.HttpClient())
            {
                var byteArray = Encoding.UTF8.GetBytes(APIClientId + ":" + APISecret);
                client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", Convert.ToBase64String(byteArray));

                var url = new Uri("https://api.sandbox.paypal.com/v1/oauth2/token", UriKind.Absolute);

                client.DefaultRequestHeaders.IfModifiedSince = DateTime.UtcNow;

                var requestParams = new List<KeyValuePair<string, string>>
                            {
                                new KeyValuePair<string, string>("grant_type", "client_credentials")
                            };

                var content = new FormUrlEncodedContent(requestParams);
                var webresponse = await client.PostAsync(url, content);
                var jsonString = await webresponse.Content.ReadAsStringAsync();

                // response will deserialized using Jsonconver
                var payPalTokenModel = JsonConvert.DeserializeObject<PayPalTokenModel>(jsonString);
            }
        }
        catch (System.Exception ex)
        {
            //TODO: Log connection error
        }
    }
}

public class PayPalTokenModel 
{
    public string scope { get; set; }
    public string nonce { get; set; }
    public string access_token { get; set; }
    public string token_type { get; set; }
    public string app_id { get; set; }
    public int expires_in { get; set; }
}

这段代码对我来说工作得很好，希望你也一样。这些功劳属于帕特尔·哈沙尔，他在这里发布了自己的解决方案。