OCP-2

  public class BaseOperation
    {
        public async Task<T> GetAsync<T>(string endpoint) where T : class
        {
            string content;
            using (var client = new HttpClient())
            {
                try
                {
                    Authenticate.ClientAuthentication(client);

                    content = await client.GetStringAsync(endpoint).ConfigureAwait(false);
                }
                catch (Exception ex)
                {
                    throw ex;
                }
            }
            return JsonConvert.DeserializeObject<T>(content);
        }
}