Walk-through for consuming a web service that uses ADFS

[ETAzero]

I found many step by steps on ADFS but nothing that walksthrough on making a direct call to an ADFS service?

I have a web application and wrote this based on the Microsoft doc on ADFS but I get an error no matter what I use.

Is there something I have to set up in the web.config?

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public string AuthorizationRequestToken(string uri, string resource_urn, string method = "POST", string redirect_uri = "", string code="")
{
ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;

var request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(uri);
request.Headers.Add("grant_type", "authorization_code");
request.Headers.Add("code", code);
request.Headers.Add("resource", resource_urn);
request.Headers.Add("client_id", Key);
request.Headers.Add("redirect_uri", redirect_uri);
request.Headers.Add("client_secret", Secret);
request.Method = method;
request.ContentType = "text/xml";
request.ContentLength = 0;

using (var response = (System.Net.HttpWebResponse)request.GetResponse())
{
using (var reader = new System.IO.StreamReader(response.GetResponseStream()))
{
var r = reader.ReadToEnd();
return r;
}
}
}

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