以下是签约免密支付的拉起代码，请查看。

WXOpenBusinessWebViewReq *req = [[WXOpenBusinessWebViewReq alloc] init];

req.businessType = 12;

NSMutableDictionary *queryInfoDic = [NSMutableDictionary dictionary];

[queryInfoDic setObject:url forKey:@"pre_entrustweb_id"];

req.queryInfoDic = queryInfoDic;

[WXApi sendReq:req completion:^(BOOL success) {}];