Paypal 通过静默 url 定期订阅在真实账户上给出无效响应和空白状态和订阅 ID,但这适用于沙盒账户。
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 += "¤cy_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