整合paypal接口的问题

Question

//string redirect = "";
            //redirect += "https://www.paypal.com/row/cgi-bin/webscr/[email protected]";
            //redirect += "&item_name=" + siteName + " Order " + orderId;
            //redirect += "&item_number=" + orderId;
            //redirect += "&amount=" + String.Format("{0:0.00} ", amount);
            //redirect += "&currency=USD";            //redirect += "&return=http://www.xx.com/";
            ////如果失败回到的页面
            //redirect += "&cancel_return=http://www.xx.com/Error.aspx";
            //// 重定向到付款页面
            //Response.Redirect(redirect);以上的发送代码是否正确？
接收paypal返回的参数，他的参数名是什么，用于更新相应订单状态的。
谢谢

Answer 1

item_name = Request.Params["item_name"];
        item_number = Request.Params["item_number"];
        payment_status = Request.Params["payment_status"];
        mc_gross = Request.Params["mc_gross"];
        mc_currency = Request.Params["mc_currency"];
        txn_id = Request.Params["txn_id"];
        receiver_email = Request.Params["receiver_email"];
        payer_email = Request.Params["payer_email"];
        string strResponse = GetPaypalNotifyValue();
        if (strResponse.Equals("VERIFIED"))
        {
            if (payment_status.Equals("Completed"))
            {
                  Response.Write("付款成功");
             }
         } 
    public static string GetPaypalNotifyValue()
    {
        string strFormValues = HttpContext.Current.Request.Form.ToString();        string strNewValue;
        string strResponse;
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create("https://www.paypal.com/cgi-bin/webscr");//
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";
        strNewValue = strFormValues + "&cmd=_notify-validate";
        req.ContentLength = strNewValue.Length;
        StreamWriter stOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);
        stOut.Write(strNewValue);
        stOut.Close();
        StreamReader stIn = new StreamReader(req.GetResponse().GetResponseStream());
        strResponse = stIn.ReadToEnd();
        stIn.Close();
        return strResponse;
    }