ZenMoney get code C# code

ZenMoney_API_get_code.cs

  [Fact]
        public async void GetZenmoneyCode()
        {
            var url = "https://api.zenmoney.ru/";
            var clientId = _secrets.ZenMoneyClientId;
            var clientSecret = _secrets.ZenMoneyClientSecret;
            var redirectUri = "http://localhost/login";

           
            var restClient = new RestClient(url);
            var request = new RestRequest("oauth2/authorize") {Method = Method.POST};
            request.AddHeader("Accept", "application/json");
            request.AddHeader("Content-Type", "application/x-www-form-urlencoded");
            request.AddParameter("client_id", clientId);
            request.AddParameter("response_type", "code");
            request.AddParameter("redirect_uri", redirectUri);
            var tResponse = await restClient.ExecuteAsync(request);
            var responseJson = tResponse.Content;
            _output.WriteLine(responseJson);
        }