code: def unpack_rsp(cls, rsp_pb):
          
          if rsp_pb.retType != RET_OK:
              return RET_ERROR, rsp_pb.retMsg, None
  
          order_id = str(rsp_pb.s2c.orderID)
          modify_order_list = [{
              'trd_env': TRADE.REV_TRD_ENV_MAP[rsp_pb.s2c.header.trdEnv],
              'order_id': order_id
          }]
  
          return RET_OK, "", modify_order_list
docs: Convert from PLS response to user response