code: def unpack_rsp(cls, rsp_pb):
          
          if rsp_pb.retType != RET_OK:
              return RET_ERROR, rsp_pb.retMsg, None
  
          raw_order_list = rsp_pb.s2c.orderList
          order_list = [OrderListQuery.parse_order(rsp_pb, order) for order in raw_order_list]
          return RET_OK, "", order_list
docs: Convert from PLS response to user response