public async Task <IEnumerable <IntrospectionResponse> > Execute(IEnumerable <string> rpts)
        {
            if (rpts == null || !rpts.Any())
            {
                throw new ArgumentNullException(nameof(rpts));
            }

            var concatenatedRpts = string.Join(",", rpts);

            _umaServerEventSource.StartToIntrospect(concatenatedRpts);
            var rptsInformation = await _rptRepository.Get(rpts);

            if (rptsInformation == null || !rptsInformation.Any())
            {
                throw new BaseUmaException(ErrorCodes.InvalidRpt,
                                           string.Format(ErrorDescriptions.TheRptsDontExist, concatenatedRpts));
            }

            var tickets = await _ticketRepository.Get(rptsInformation.Select(r => r.TicketId));

            if (tickets == null || !tickets.Any() || tickets.Count() != rptsInformation.Count())
            {
                throw new BaseUmaException(ErrorCodes.InternalError,
                                           ErrorDescriptions.AtLeastOneTicketDoesntExist);
            }

            var result = new List <IntrospectionResponse>();

            foreach (var rptInformation in rptsInformation)
            {
                var record = new IntrospectionResponse
                {
                    Expiration = rptInformation.ExpirationDateTime.ConvertToUnixTimestamp(),
                    IssuedAt   = rptInformation.CreateDateTime.ConvertToUnixTimestamp()
                };

                var ticket = tickets.First(t => t.Id == rptInformation.TicketId);
                if (rptInformation.ExpirationDateTime < DateTime.UtcNow ||
                    ticket.ExpirationDateTime < DateTime.UtcNow)
                {
                    _umaServerEventSource.RptHasExpired(rptInformation.Value);
                    record.IsActive = false;
                }
                else
                {
                    record.Permissions = new List <PermissionResponse>
                    {
                        new PermissionResponse
                        {
                            ResourceSetId = rptInformation.ResourceSetId,
                            Scopes        = ticket.Scopes,
                            Expiration    = ticket.ExpirationDateTime.ConvertToUnixTimestamp()
                        }
                    };

                    record.IsActive = true;
                }

                result.Add(record);
            }

            _umaServerEventSource.EndIntrospection(JsonConvert.SerializeObject(result));
            return(result);
        }