APIHelper.cs

using Newtonsoft.Json;
using RestSharp;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TestAutomationAPI
{
    public class APIHelper<T>
    {
        public RestClient restClient;
        public RestRequest restRequest;
        public string baseUrl = "https://reqres.in/";

        public RestClient SetUrl()
        {
            var restClient = new RestClient(baseUrl);
            return restClient;
        }

        public RestRequest CreatePostRequest(string body, string endPoint)
        {
            var restRequest = new RestRequest(endPoint, Method.Post);
            restRequest.AddHeader("Accept", "application/json");
            restRequest.AddParameter("application/json", body, ParameterType.RequestBody);
            return restRequest;
        }

        public RestRequest CreateGetRequest()
        {
            {
                var restRequest = new RestRequest();
                restRequest.AddHeader("Accept", "application/json");
                return restRequest;
            }
        }

        public RestResponse GetResponse(RestClient client, RestRequest request)
        {
            return client.Execute(request);
        }

        public DTO GetContent<DTO>(RestResponse response)
        {
            var content = response.Content;
            DTO dtoObject = JsonConvert.DeserializeObject<DTO>(content);
            return dtoObject;
        }
    }
}