public async Task CreateAsync(AuthenticationTokenCreateContext context)
        {
            var refreshTokenId = Guid.NewGuid().ToString("n");

            using (var ctx = new ApplicationDbContext())
            {
                var token = new RefreshToken()
                {
                    Id = Helper.GetHash(refreshTokenId),
                    Subject = context.Ticket.Identity.Name,
                    IssuedUtc = DateTime.UtcNow,
                    ExpiresUtc = DateTime.UtcNow.AddDays(30)
                };

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

                token.ProtectedTicket = context.SerializeTicket();

                var result = await ctx.AddRefreshToken(token);

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

            }

        }