public async Task <Unit> Handle(RevokeRefreshToken request, CancellationToken cancellationToken)
        {
            var token  = request.Token;
            var userId = request.UserId;

            var refreshToken = await RefreshTokenRepository.GetAsync(token);

            if (refreshToken == null || refreshToken.UserId != userId)
            {
                throw new IdentityException(Codes.RefreshTokenNotFound,
                                            "Refresh accessToken was not found.");
            }

            refreshToken.Revoke();
            await RefreshTokenRepository.UpdateAndSaveAsync(refreshToken);

            return(Unit.Value);
        }