=== AccountController.cs ===
using IdentityModel.Client;
using Kim.Framework.Dto;
using Microsoft.AspNetCore.Mvc;
using srv.app.id.ladaexpress.vn.Infrastructure.Dto.Models.Accounts;
using srv.app.id.ladaexpress.vn.Infrastructure.Dto.Results.Accounts;
using System;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;
using static IdentityModel.OidcConstants;

namespace srv.app.id.ladaexpress.vn.Controllers
{
    [Route("[controller]")]
    [ApiController]
    public class AccountController : ControllerBase
    {
        [HttpPost]
        public async Task<IActionResult> Login(LoginModel model)
        {
            var result = new LoginResult();
            if (!ModelState.IsValid)
            {
                var allErrors = ModelState.Values.SelectMany(v => v.Errors.Select(e=>e.ErrorMessage)).ToList();
                result.Result = Result.Failed;
                result.Message = string.Join("\n", allErrors);
            }
            else
            {
                HttpClient httpClient = new HttpClient();
                var disco = await httpClient.GetDiscoveryDocumentAsync("https://id.ladaexpress.vn");
                PasswordTokenRequest passwordTokenRequest = new PasswordTokenRequest()
                {
                    Address = disco.TokenEndpoint,
                    ClientId = "AppClients",
                    ClientSecret = "kNbPZcuUMc6nufZ2oIJN",
                    GrantType = GrantTypes.Password,
                    Scope = "BackEnd",
                    UserName = model.UserName,
                    Password = model.Password
                };

                var tokenResponse = await httpClient.RequestPasswordTokenAsync(passwordTokenRequest);

                if (tokenResponse.IsError)
                {
                    Console.WriteLine(tokenResponse.Error);
                    result.Result = Result.Failed;
                    result.Message = $"{tokenResponse.Error}: {tokenResponse.ErrorDescription}";

                }
                else
                {
                    result.Token = tokenResponse.AccessToken;
                }

                Console.WriteLine(tokenResponse.Json);
                Console.WriteLine("\n\n");
            }

            return Ok(result);

        }
    }
}