PayPal 与 ASP.NET / C# 的集成

Question

首先，让我说我在这方面已经太久了，我认为我坚持的部分应该是最简单的任务。然而，我无法做到。我真的很困惑。

我正在将 PayPal 集成到我的网站中。我以前开发过很多网站，但这是我第一次做支付。

我有以下代码（未修改 - 我复制并粘贴了 [不要惊慌！我这样做是有原因的]）：

// ASP .NET C#

using System;
using System.IO;
using System.Text;
using System.Net;
using System.Web;

public partial class csIPNexample : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //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")
        {
            //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
        }
        else if (strResponse == "INVALID")
        {
            //log for manual investigation
        }
        else
        {
            //log response/ipn data for manual investigation
        }
    }
}

现在，我知道这段代码的含义，也知道它的作用。我唯一遇到困难的部分是这部分：

if (strResponse == "VERIFIED")
{
    //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
}
else if (strResponse == "INVALID")
{
    //log for manual investigation
}
else
{
    //log response/ipn data for manual investigation
}

哪个，你现在可能在笑。没关系：

//check the payment_status is Completed

我认为这行应该这样写：

@{
    if(Request.QueryString["payment_status"] == "Completed")
    {
        // Payment status is completed.
    }
}

而且，我认为我应该对其余的注释行做几乎相同的事情（获取 Request["etc"] 变量并比较它们的值），并将数据与数据库中相关的数据进行匹配给用户。

有人可以帮帮我吗？我真的到处找遍了，似乎我能在网上找到的所有代码示例都没有向您展示这部分的代码。

非常感谢您的帮助。

谢谢

Answer 1

你的台词会是这样的，它的回放是一个帖子！内容是经过验证的，但值在帖子上，而不是在网址上。

if (strResponse == "VERIFIED")
{
    // Now All informations are on
    HttpContext.Current.Request.Form;
    // for example you get the invoice like this
    HttpContext.Current.Request.Form["invoice"] 
    // or the payment_status like
    HttpContext.Current.Request.Form["payment_status"] 
}
else
{
  //log for manual investigation
}

现在，在验证响应并完成 Payment_status 后，您在 txn_type 上有额外的选项，您可以检查电子邮件是否正确、金额是否正确等。所以您询问的代码将如下所示：

@{
    if(HttpContext.Current.Request.Form["payment_status"] == "Completed")
    {
        // Payment status is completed.
    }
}

您可以查看payment_status == "Completed"是否表示订单已完成，但您还需要查看金额是否正确，邮箱是否正确，其他原因是否正确（比如pending, echeck, hold)