通过静默url的Paypal定期订阅是否给出无效响应？

通过静默url的Paypal定期订阅在live帐户上提供无效响应、空白状态和订阅id，但在沙盒帐户上工作正常

string cmd = "_xclick-subscriptions";
        string redirect = "";        
        redirect += "?cmd=" + cmd;
        redirect += "&business=" + businessEmail;
        redirect += "&item_name=" + lblDesc.Text.Trim();        
        redirect += "&no_shipping=" + "2";
        redirect += "&no_note=" + "1";
        redirect += "&currency_code=" + "USD";
        redirect += "&lc=" + "";        
        redirect += "&return=" + successPage;
        redirect += "&cancel_return=" + FailurePage;
        redirect += "notify_url=" + successPage;
        redirect += "&rm=" + "2";
        //for first month free count=1
        redirect += "&a1=" + "0.0";
        redirect += "&p1=" + count.ToString();
        redirect += "&t1=" + "M";
        //new added parameter for recurring
        redirect += "&a3=" + total;
        redirect += "&p3=" + count.ToString();
        redirect += "&t3=" + "M";
        redirect += "&src=" + "1";
        redirect += "&sra=" + "1";      

        return "https://www.paypal.com/cgi-bin/webscr"+ redirect;

得到回应

https://www.paypal.com/cgi-bin/webscr&cmd=_notify-validate

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如果您试图使用PDT获取响应，然后掉头验证，请确保您的帐户中已启用PDT并设置了返回URL。然后尝试删除返回url和传递的rm变量的代码行

你是指当你被发送到PayPal时，你得到的是一个空白页面，还是当你被重定向回你的站点时，你得到的是一个空白页面？是的，当我从PayPal返回时，没有值。