I am trying to get an access token from PayPal.

I have set it up as an application within PayPal, and I can see my client ID and secret

I am assuming I don't want to expose my secret in the javascript front end, so I am attempting to get the access code from the C#, pass the token to the front end so I can make AJAX posts/gets.

However, it always returns with unauthorized

This is my effort

var url = "https://api.paypal.com/v1/oauth2/token";

var clientId = "myClientId";
var pwrd = "mySecret";

var client = new WebClient();
client.Credentials = new NetworkCredential(clientId, pwrd);
client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
client.Headers.Add("Accept: application/json");
var result = "";
using (var httpClient = new HttpClient())
{
    var response = await httpClient.PostAsync(url, null);
    result = response.StatusCode.ToString();
}

return View(model: result);
   

I do not understand why, when I run this from my live application, it fails

Edit

I replaced

using (var httpClient = new HttpClient())
{
    var response = await httpClient.PostAsync(url, null);
    result = response.StatusCode.ToString();
}

with

var clientId = "myClientId";
var seceret = "mySecret";

var client = new HttpClient();

client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(
    "Basic", Convert.ToBase64String(
        System.Text.ASCIIEncoding.ASCII.GetBytes(
           $"{clientId}:{seceret}")));

 var dict = new Dictionary<string, string>();
 dict.Add("Content-Type", "application/x-www-form-urlencoded");

 var req = new HttpRequestMessage(HttpMethod.Post, url) { Content = new FormUrlEncodedContent(dict) };
 var response = await client.SendAsync(req);

The same issue persists. I get a 401

CodePudding user response：

And it will never authorize, because HttpClient variable knows nothing about your credentials. You initialized it in WebClient, but you are not using it.

CodePudding user response：

To elaborate on the comment and other answer, here you create a variable named client

var client = new WebClient();
client.Credentials = new NetworkCredential(clientId, pwrd);
client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
client.Headers.Add("Accept: application/json");

And in the next code that follows, you do nothing using that client variable. The above is completely ignored and irrelevant to this:

using (var httpClient = new HttpClient())
{
    var response = await httpClient.PostAsync(url, null);
    result = response.StatusCode.ToString();
}

return View(model: result);

So, make use of the client object you created -- likely with UploadValues or similar.