new_contents: 
  from selvbetjening.core.events.models import request_attendee_pks_signal, find_attendee_signal, Attend
  
  
  def avacon_style_attendee_pks_handler(sender, **kwargs):
      attendee = kwargs['attendee']
      key = 'Avacon.%s.%s.%s' % (attendee.event.pk,
                                 attendee.user.pk,
                                 attendee.invoice.pk)
  
      return ('Avacon-Style ID', key)
  
  request_attendee_pks_signal.connect(avacon_style_attendee_pks_handler)
  
  
  def avacon_style_find_attendee_handler(sender, **kwargs):
      pk = kwargs['pk']
  
      try:
          avacon, event_pk, user_pk, invoice_pk = pk.split('.')
  
          attendee = Attend.objects.get(user__pk=user_pk,
              invoice__pk=invoice_pk,
              event__pk=event_pk)
  
          return ('Avacon', attendee)
  
      except:
          return None
  
  find_attendee_signal.connect(avacon_style_find_attendee_handler)
subject: Add avacon-style payment ids like the ones used at svscon