docs: def _prepare_orders(self, orders):
          """
          Each order needs to have all it's details filled with default value,
          or None, in case those are not already filled.
          """
  
          for detail in PAYU_ORDER_DETAILS:
              if not any([detail in order for order in orders]):
                  for order in orders:
                      order[detail] = PAYU_ORDER_DETAILS_DEFAULTS.get(detail, None)
  
          return orders