移动端iOS。《商户传入的appid参数不正确，请联系商户处理

PayReq *req = [[PayReqalloc] init];

    req.openID = [wechatPayDic objectForKey@"appid"];

    req.partnerId = [wechatPayDic objectForKey@"mch_id"];

    req.prepayId = [wechatPayDic objectForKey@"prepay_id"];

    req.package = @"Sign=WXPay"

    req.nonceStr = [wechatPayDic objectForKey@"noncestr"];

    req.timeStamp = [[wechatPayDic objectForKey@"timestamp"] intValue];

    req.sign = [wechatPayDic objectForKey@"sign"];

    WXApisendReq:req];