public async Task CreateAsync(AuthenticationTokenCreateContext context)
        {
            var clientid = context.Ticket.Properties.Dictionary["as:client_id"];

            if (string.IsNullOrEmpty(clientid))
            {
                return;
            }

            var refreshTokenId = Guid.NewGuid().ToString("n");

            using (IAuthService authService = new AuthService(new AuthInfrastructure(new SqlServerAccess <RefreshToken>("ASConnectionString"))))
            {
                var refreshTokenLifeTime = context.OwinContext.Get <string>("as:clientRefreshTokenLifeTime");

                var token = new RefreshToken()
                {
                    RefreshTokenId = refreshTokenId,
                    ClientId       = clientid,
                    Subject        = context.Ticket.Identity.Name,
                    IssuedUtc      = DateTime.UtcNow,
                    ExpiresUtc     = DateTime.UtcNow.AddMinutes(Convert.ToDouble(refreshTokenLifeTime))
                };

                context.Ticket.Properties.IssuedUtc  = token.IssuedUtc;
                context.Ticket.Properties.ExpiresUtc = token.ExpiresUtc;

                token.ProtectedTicket = context.SerializeTicket();

                var result = authService.AddRefreshTokens(token.ItemToList());

                if (result)
                {
                    context.SetToken(refreshTokenId);
                }
            }
        }