private async Task <Tokens> CreateTokens(string username)
        {
            UserDto user = await managementService.GetUserData(username);

            var claims      = user.CreateClaims();
            var token       = tokenUtil.CreateToken(claims);
            var tokenString = new JwtSecurityTokenHandler().WriteToken(token);

            string refreshToken = tokenUtil.GenerateRefreshToken();

            return(new Tokens
            {
                Token = tokenString,
                RefreshToken = refreshToken
            });
        }