Result.cs

    public enum Result
    {
        Succeeded = 0,
        Failed = -1,
        Unauthorized = -5,
        InternalError = -10,
        UserNotFound = -15,
        IncorrectEmail = -20,
        EmailNotConfirmed = -25,
        IncorrectSecurityCode = -30,
        InvalidPermit = -35,
        InvalidShare = -40,
        LoginFailed = -45
    }
    
    // GET api/permits/{email}
    [HttpGet("{email}")]
    public async Task<object> QueryTokenAsync(string email, [FromQuery] string password)
    {
        if (string.IsNullOrEmpty(email))
        {
            return this.NestResult(Result.IncorrectEmail); 
        }

        var result = await _signInManager.PasswordSignInAsync(email, password, false, false);

        if (result.Succeeded)
        {
            Permit permit = new Permit();
            permit.Password = password;
            permit.Owner = await _userManager.FindByNameAsync(email);
            permit.Token = await GenerateJwtTokenAsync(permit.Owner);

            return this.NestResultSingle(
                Result.Succeeded, permit, "A new token has been created for the permit");
        }

        return this.NestResult(Result.LoginFailed);
    }