SwitchBot Lock Key SRP

Program.cs

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Text.Encodings.Web;
using System.Text.Json;
using System.Threading.Tasks;

namespace SwitchBotAPITest3
{
    internal class Program
    {
        static async Task Main()
        {
            var httpClient = new HttpClient(new HttpClientHandler()
            {
                //Proxy = new WebProxy("localhost", 8888)
            });

            var clientId = "5nnwmhmsa9xxskm14hd85lm9bm";
            var userName = "<your account mailaddress>";
            var userPassword = "<your account password>";
            var deviceMac = "<your lock device mac without Colon and UpperCase>";

            LoginResp loginResp;

            {
                var json = JsonSerializer.Serialize(new
                {
                    clientId = clientId,
                    username = userName,
                    password = userPassword,
                    grantType = "password",
                    verifyCode = "",
                }, DefaultJsonSerializerOption);
                var response = await httpClient.PostAsync("https://account.api.switchbot.net/account/api/v1/user/login"
                    , new StringContent(json, Encoding.UTF8, "application/json1"));
                response.EnsureSuccessStatusCode();
                var responseString = await response.Content.ReadAsStringAsync();
                loginResp = JsonSerializer.Deserialize<LoginResp>(responseString)!;
            }

            CommunicateResp communicateResp;
            {
                var json = JsonSerializer.Serialize(new
                {
                    device_mac = deviceMac,
                    keyType = "user",
                }, DefaultJsonSerializerOption);

                var requestMessage = new HttpRequestMessage
                {
                    Method = HttpMethod.Post,
                    Content = new StringContent(json, Encoding.UTF8, "application/json"),
                    RequestUri = new Uri("https://wonderlabs.us.api.switchbot.net/wonder/keys/v1/communicate")
                    //RequestUri = new Uri("https://wonderlabs.ap.api.switchbot.net/wonder/keys/v1/communicate")
                    //RequestUri = new Uri("https://wonderlabs.eu.api.switchbot.net/wonder/keys/v1/communicate")
                };
                requestMessage.Headers.Authorization = new AuthenticationHeaderValue(loginResp.body.access_token);
                var response = await httpClient.SendAsync(requestMessage);
                response.EnsureSuccessStatusCode();
                var responseString = await response.Content.ReadAsStringAsync();
                communicateResp = JsonSerializer.Deserialize<CommunicateResp>(responseString)!;
            }

            Console.WriteLine($"statusCode:{communicateResp.statusCode},message:{communicateResp.message}");
            Console.WriteLine($"keyId:{communicateResp.body.communicationKey.keyId},key:{communicateResp.body.communicationKey.key}");
        }
        static JsonSerializerOptions DefaultJsonSerializerOption = new JsonSerializerOptions()
        {
            Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping
        };
        public class LoginResp
        {
            public int statusCode { get; set; }
            public string message { get; set; }
            public Body body { get; set; }

            public class Body
            {
                public string access_token { get; set; }
                public int expires_in { get; set; }
                public int refresh_expires_in { get; set; }
                public string refresh_token { get; set; }
                public string token_type { get; set; }
            }
        }

        public class CommunicateResp
        {
            public int statusCode { get; set; }
            public Body body { get; set; } = default!;
            public string message { get; set; } = default!;
            public class Body
            {
                public Communicationkey communicationKey { get; set; } = default!;
                public class Communicationkey
                {
                    public string keyId { get; set; } = default!;
                    public string keyType { get; set; } = default!;
                    public long createTime { get; set; }
                    public string key { get; set; } = default!;
                }
            }
        }
    }
}