code: def getTotalPaid(self, auction_id, buyer_id):
          
          # TODO: it has to be better way to check payments.
          date_end = long(time.time())
          date_start = date_end - 60 * 60 * 24 * 90
          rc = self.__ask__('doGetMyIncomingPayments',
                            buyerId=buyer_id,
                            itemId=auction_id,
                            transRecvDateFrom=date_start,
                            transRecvDateTo=date_end,
                            transPageLimit=25,  # notneeded | TODO: can be more than 25 payments
                            transOffset=0)
          paid = 0
          for t in (rc or []):
              # t = t['item']
              if t['payTransStatus'] == u'Zakończona' and t['payTransIncomplete'] == 0:
                  if t['payTransItId'] == 0:  # wplata laczna
                      for td in t['payTransDetails']['item']:
                          if td['payTransDetailsItId'] == auction_id:
                              paid += Decimal(str(td['payTransDetailsPrice']))
                  else:  # wplata pojedyncza
                      paid += Decimal(str(t['payTransAmount']))
          return paid
docs: Return total paid from buyer on single auction.