protected override void ProcessContact(Contact contact)
        {
            Log.Logger.Debug($"Started processing contact {contact.Id}");
            ContactIdentifier identifier =
                contact.Identifiers.FirstOrDefault(i => i.Source == _config.IdentifierSource);

            if (identifier != null || contact.Interactions.Any(i => i.EndDateTime > DateTime.UtcNow.AddYears(-1)))
            {
                Contact existingContact = SearchContact(contact);
                if (existingContact != null)
                {
                    Log.Logger.Debug($"Found a contact for {contact.Id}, updating");
                    UpdateContact(existingContact, contact);
                }
                else
                {
                    Log.Logger.Debug($"Contact {contact.Id} is new, adding");
                    AddContact(contact);
                }
            }
            else
            {
                Log.Logger.Information($"Contact {contact.Id} was skipped");
                CurrentStatus.SkippedCounterAdd(1);
            }
        }