使用的API接口为https://api.mch.weixin.qq.com/papay/preentrustweb，调用成功后也返回了pre_entrustweb_id。 但是通过官方提供的调用方式： WXOpenBusinessWebViewReq *req = [[WXOpenBusinessWebViewReq alloc] init]; req.businessType = 12; //固定值 NSMutableDictionary *queryInfoDic = [NSMutableDictionary dictionary]; [queryInfoDic setObject:"pre_entrustweb_id" forKey:"5778aadY9nltAsZzXixCkFIGYnV2V"]; req.queryInfoDic = queryInfoDic; [WxApi sendReq:req]; 却提示mch_id 参数构造错误。