微信支付报错：解析失败

            if ([WXApi isWXAppInstalled]) {                NSDictionary *dic = responseObject[@"d"];                PayReq *req = [[PayReq alloc] init];                req.partnerId = dic[@"partnerid"];                req.prepayId  = dic[@"prepayid"];                req.nonceStr  = dic[@"noncestr"];                req.timeStamp = [dic[@"timestamp"] intValue];                req.package   = dic[@"package"];                req.sign      = dic[@"sign"];                                [WXApi sendReq:req];            }

req.package 所需参数是：Sign=WXpay。

参考博客：http://blog.csdn.net/minggeqingchun/article/details/52774481