How to setup Pocket for API calls

UrlCallForPocket.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

namespace URLCall
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Getting started");
            /*var consumer_key = "";
            var request_tk = "";

            HttpClient client = new HttpClient();
            var values = new Dictionary<string, string>
            {
                { "consumer_key", consumer_key },
                { "redirect_uri", "NewsScraper:authorizationFinished" }
            };

            
            var content = new FormUrlEncodedContent(values);

            var response = client.PostAsync("https://getpocket.com/v3/oauth/request", content).Result;
            if (response.IsSuccessStatusCode)
            {
                var responseContent = response.Content;

                // by calling .Result you are synchronously reading the result
                var responseString = responseContent.ReadAsStringAsync().Result;

                request_tk = responseString.Substring(5);
                var url_callback = "https://infocollection.azurewebsites.net/api/HttpTriggerCSharp1?code=COHrQvNMNEDkhm2TXe7Pv6y7I3eBK9jvVEF947WhsdN7a1wVvdGesQ==";
                Console.WriteLine($"https://getpocket.com/auth/authorize?request_token={request_tk}&redirect_uri={url_callback}");
                //
            }
            
            Console.ReadLine();
            // convert the code to an access token
            values = new Dictionary<string, string>
            {
                { "consumer_key", consumer_key },
                { "code", request_tk }
            };

            
            content = new FormUrlEncodedContent(values);

            response = client.PostAsync("https://getpocket.com/v3/oauth/authorize", content).Result;
            if (response.IsSuccessStatusCode)
            {
                var responseContent = response.Content;

                // by calling .Result you are synchronously reading the result
                var responseString = responseContent.ReadAsStringAsync().Result;

                Console.WriteLine(responseString);
            } else
            {
                Console.WriteLine("Cannot get access token");
                Console.WriteLine(response.RequestMessage.ToString());
            }
            */

            addUrl();

            Console.ReadLine();

        }

        static void addUrl()
        {
            Console.WriteLine("adding URL");
            HttpClient client = new HttpClient();
            var values = new Dictionary<string, string>
            {
                { "consumer_key", "" },
                { "access_token", "" },
                { "url", "https://hbr.org/2018/01/machine-learning-can-help-b2b-firms-learn-more-about-their-customers" },
                { "tags", "datascience,machinelearning,AI" }
            };

            var content = new FormUrlEncodedContent(values);

            var response = client.PostAsync("https://getpocket.com/v3/add", content).Result;
            if (response.IsSuccessStatusCode)
            {
                Console.WriteLine("successfully adding URL");
                var responseContent = response.Content;

                // by calling .Result you are synchronously reading the result
                var responseString = responseContent.ReadAsStringAsync().Result;

                Console.WriteLine(responseString);
            } else
            {
                Console.WriteLine("Cannot add URL");
            }

            Console.WriteLine("finished adding URL");

        }
    }
}