public void BuildIdentifiers()
        {
            var zoneTask = CloudflareClient.GetAllZonesAsync();

            zoneTask.RunSynchronously();
            zoneTask.Wait();
            var presentZones = zoneTask.Result;
            Dictionary <string, string> zoneIdentifiers       = new Dictionary <string, string>();
            HashSet <string>            neededZoneIdentifiers = new HashSet <string>();

            foreach (var zone in Configuration.Domains)
            {
                neededZoneIdentifiers.Add(zone.ZoneName);
            }
            foreach (var zone in presentZones)
            {
                if (neededZoneIdentifiers.Contains(zone.Name))
                {
                    zoneIdentifiers.Add(zone.Name, zone.Id);
                    neededZoneIdentifiers.Remove(zone.Name);
                }
            }
            if (neededZoneIdentifiers.Count > 0)
            {
                eventLog.WriteEntry($"The following DNS zones could not be found on CloudFlare. Any records under these zones will not be updated:\n{neededZoneIdentifiers.ToString()}", EventLogEntryType.Warning);
            }

            HashSet <FullyQualifiedDomainName> neededDomains = new HashSet <FullyQualifiedDomainName>(Configuration.Domains);

            foreach (var zone in zoneIdentifiers)
            {
                var domainListTask = CloudflareClient.GetAllDnsRecordsAsync(zone.Value);
            }
        }