c# - 从 paypal 沙箱中获取响应

Question

我正在尝试将 paypal 沙箱与我的 asp.net 代码集成。要求是我必须将用户带到 Paypal 网站，用户将使用他的凭据登录并支付指定的金额。

现在我可以将用户带到 paypal 网站并按照下面的代码成功完成交易。我的下一步是从 paypal 获得响应。在响应中，我需要状态，而且我将在重定向到我想要在响应中的 paypal 站点时发送一个 uniqueid，以便我的应用程序可以识别响应来自哪个用户。

private void PayJNP()
    {
        try
        {
            string redirectUrl = "";
            redirectUrl += "https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_xclick&business=" + ConfigurationManager.AppSettings["paypalemail"].ToString();
            redirectUrl += "&first_name=ATPTrader";
            redirectUrl += "&item_name=JNP";
            redirectUrl += "&amount=100";
            redirectUrl += "&return=" + ConfigurationManager.AppSettings["SuccessURL"].ToString();
            redirectUrl += "&cancel_return=" + ConfigurationManager.AppSettings["FailedURL"].ToString();
            Response.Redirect(redirectUrl);
        }
        catch (Exception Ex)
        {

        }
    }

请帮助我捕获响应。

TIA

---

我已经开始实现 IPN，但遇到了一些问题

我已经在paypal网站配置了IPN

通过一些隐藏控件，我将数据发送到 paypal 沙箱

<form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post" id="form1"
        name="form1">
        <input type="hidden" name="cmd" value="_xclick"/>
        <input type="hidden" name="business" value="shantanusenin@gmail.com"/><!--Paypal or sandbox Merchant account -->
        <input type="hidden" name="item_name" value="JNP"/>
        <input type="hidden" name="item_number" value="1"/>
        <input type="hidden" name="amount" value="100"/>
        <input type="hidden" name="return" value="http://alltradepartners.com/test/paypal.aspx"/><!--this page will be your redirection page -->
        <input type="hidden" name="cancel_return" value="http://alltradepartners.com/test/partnerregistration.aspx"/>
        <input type="hidden" name="currency_code" value="USD"/>
        <input type="hidden" name="notify_url" value="http://alltradepartners.com/test/paypal.aspx"/><!--this should be your domain web page where you going to receive all your transaction variables -->
    </form>

现在我有一个收集响应的页面

//Post back to either sandbox or live
        string strSandbox = "https://www.sandbox.paypal.com/cgi-bin/webscr";
        // string strLive = "https://www.paypal.com/cgi-bin/webscr";
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(strSandbox);

        //Set values for the request back
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";
        byte[] param = Request.BinaryRead(HttpContext.Current.Request.ContentLength);
        string strRequest = Encoding.ASCII.GetString(param);
        strRequest += "&cmd=_notify-validate";
        req.ContentLength = strRequest.Length;

        //for proxy
        //WebProxy proxy = new WebProxy(new Uri("http://url:port#"));
        //req.Proxy = proxy;

        //Send the request to PayPal and get the response
        StreamWriter streamOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);
        streamOut.Write(strRequest);
        streamOut.Close();
        StreamReader streamIn = new StreamReader(req.GetResponse().GetResponseStream());
        string strResponse = streamIn.ReadToEnd();

        streamIn.Close();

        if (strResponse == "VERIFIED")
        {

            Response.Write("VERIFIED");
            //UPDATE YOUR DATABASE

            //TextWriter txWriter = new StreamWriter(Server.MapPath("../uploads/") + Session["orderID"].ToString() + ".txt");
            //txWriter.WriteLine(strResponse);
            //txWriter.Close();

            //check the payment_status is Completed
            //check that txn_id has not been previously processed
            //check that receiver_email is your Primary PayPal email
            //check that payment_amount/payment_currency are correct
            //process payment





            NameValueCollection these_argies = HttpUtility.ParseQueryString(strResponse);
            string user_email = these_argies["payer_email"];
            string pay_stat = these_argies["payment_status"];
            //.
            //.  more args as needed look at the list from paypal IPN doc
            //.


            if (pay_stat.Equals("Completed"))
            {
                Response.Write("Completed");
                //Send_download_link("yours_truly@mycompany.com", user_email, "Your order", "Thanks for your order this the downnload link ... blah blah blah");
            }       

        }
        else if (strResponse == "INVALID")
        {
            Response.Write("INVALID");
            //UPDATE YOUR DATABASE

            //TextWriter txWriter = new StreamWriter(Server.MapPath("../uploads/") + Session["orderID"].ToString() + ".txt");
            //txWriter.WriteLine(strResponse);
            ////log for manual investigation
            //txWriter.Close();
        }
        else
        {
            Response.Write("SUCCESS");
            //UPDATE YOUR DATABASE

            //TextWriter txWriter = new StreamWriter(Server.MapPath("../uploads/") + Session["orderID"].ToString() + ".txt");
            //txWriter.WriteLine("Invalid");
            ////log response/ipn data for manual investigation
            //txWriter.Close();
        }

现在我可以发送请求并获得已验证的响应，但我没有获得 tranactionID。请提出我遗漏的地方

TIA

Answer 1

我建议您使用即时付款通知 (IPN)。使用 IPN，您会在每次交易后收到一条回传到您设置的通知 URL，告诉您付款是否已完成。

您将使用 notify_url 变量定义通知 URL。

这是指向我们的 IPN 代码示例的链接: https://github.com/paypal/ipn-code-samples

如果您对服务有具体问题，我可以进一步帮助您。