How to insert data from access token request?

How to insert data from access token request?

My customer sent a url like this;{refreshToken}&client_id={client_id}&client_secret={client_secret}&grant_type=refresh_token

I want to write a insert code according to this. My code is below but I'm not sure this code is true. I didn't find any document about send to data from access token request.

  1.  HttpWebRequest request = (HttpWebRequest)WebRequest.Create("{refreshToken}&client_id={client_id}&client_secret={client_secret}&grant_type=refresh_token");
            request.Method = "POST";
            JObject requestBody = new JObject();
            JArray recordArray = new JArray();
            JObject recordObject = new JObject();
            recordObject.Add("First_Name", contactData.FirstName);
            recordObject.Add("Mobile", contactData.PhoneNumber);
            recordObject.Add("Email", contactData.Email);
            recordObject.Add("Kategori", contactData.MessageType);
            recordObject.Add("Konu", contactData.Subject);
            recordObject.Add("Last_Name", contactData.LastName);
            recordObject.Add("Company", contactData.CompanyName);
            recordObject.Add("Sirketiniz_ile_ilgili_ozet", contactData.CompanySummary);
            requestBody.Add("data", recordArray);
            string dataString = requestBody.ToString();
            var data = Encoding.UTF8.GetBytes(dataString);
            int dataLength = data.Length;
            request.ContentLength = dataLength;
            using (var writer = request.GetRequestStream())
                writer.Write(data, 0, dataLength);
            request.KeepAlive = true;
            HttpWebResponse response;
                response = (HttpWebResponse)request.GetResponse();
            catch (WebException e)
                if (e.Response == null) { throw; }
                response = (HttpWebResponse)e.Response;
            HttpWebResponse responseEntity = response;
            Console.WriteLine("HTTP Status Code : " + (int)response.StatusCode);
            string responsestring = new StreamReader(responseEntity.GetResponseStream()).ReadToEnd();

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