使用微信支付的时候，一定要商户服务器先调用【统一下单API】生成预付单吗？

Question

看了微信的demo和文档，它们的demo里的调用支付方法
都没有商品的名称 描述 价格这些信息，
我们公司android那边说不需要先调下单api，他们都直接调用支付宝支付，
不知道该怎么实现

 + (NSString *)jumpToBizPay {

    //============================================================
    // V3&V4支付流程实现
    // 注意:参数配置请查看服务器端Demo
    // 更新时间：2015年11月20日
    //============================================================
    NSString *urlString   = @"http://wxpay.weixin.qq.com/pub_v2/app/app_pay.php?plat=ios";
        //解析服务端返回json数据
        NSError *error;
        //加载一个NSURL对象
        NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];
        //将请求的url数据放到NSData对象中
        NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
        if ( response != nil) {
            NSMutableDictionary *dict = NULL;
            //IOS5自带解析类NSJSONSerialization从response中解析出数据放到字典中
            dict = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error];

            NSLog(@"url:%@",urlString);
            if(dict != nil){
                NSMutableString *retcode = [dict objectForKey:@"retcode"];
                if (retcode.intValue == 0){
                    NSMutableString *stamp  = [dict objectForKey:@"timestamp"];

                    //调起微信支付
                    PayReq* req             = [[[PayReq alloc] init]autorelease];
                    req.partnerId           = [dict objectForKey:@"partnerid"];
                    req.prepayId            = [dict objectForKey:@"prepayid"];
                    req.nonceStr            = [dict objectForKey:@"noncestr"];
                    req.timeStamp           = stamp.intValue;
                    req.package             = [dict objectForKey:@"package"];
                    req.sign                = [dict objectForKey:@"sign"];
                    [WXApi sendReq:req];
                    //日志输出
                    NSLog(@"appid=%@\npartid=%@\nprepayid=%@\nnoncestr=%@\ntimestamp=%ld\npackage=%@\nsign=%@",[dict objectForKey:@"appid"],req.partnerId,req.prepayId,req.nonceStr,(long)req.timeStamp,req.package,req.sign );
                    return @"";
                }else{
                    return [dict objectForKey:@"retmsg"];
                }
            }else{
                return @"服务器返回错误，未获取到json对象";
            }
        }else{
            return @"服务器返回错误";
        }
}

Answer 1

。。看错了，以为是Android的