<!--paypal支付--><add key="payPalBusiness" value="你的账户"/><add key="payPalReturnUrl" value="操作完成后的返回地址"/><add key="payPalNotifyUrl" value="操作完成后的异步通知页面"/>

                string webUrl = CFun.GetAppStr("webUrl");string business = CFun.GetAppStr("payPalBusiness");string returnUrl = CFun.GetAppStr("payPalReturnUrl");string notifyUrl = CFun.GetAppStr("payPalNotifyUrl");Dictionary<string, string> sParaTemp = new Dictionary<string, string>();sParaTemp.Add("cmd", "_xclick"); //按钮类型，包含：_xclick单个商品立即购买、_xclick_subscription订阅、_cart购物车、s_x-click加密sParaTemp.Add("business", business); //商户名称sParaTemp.Add("item_name", product_name); //商品名称sParaTemp.Add("item_number", out_trade_no); //商品编号sParaTemp.Add("currency_code", "USD"); //货币类型，默认美元sParaTemp.Add("amount", payMoney.ToString()); //付款金额sParaTemp.Add("notify_url", notifyUrl); //通知地址sParaTemp.Add("cancel_return", webUrl); //取消返回地址sParaTemp.Add("return", returnUrl); //返回地址string submitHtml = PayPalSubmit.BuildRequest(sParaTemp, "post");Response.Write(submitHtml);

        /// <summary>/// 建立请求，以表单HTML形式构造（默认）/// </summary>/// <param name="sParaTemp">请求参数数组</param>/// <param name="strMethod">提交方式。两个值可选：post、get</param>/// <param name="strButtonValue">确认按钮显示文字</param>/// <returns>提交表单HTML文本</returns>public static string BuildRequest(Dictionary<string, string> dicPara, string strMethod){             //正式的是https://www.paypal.com/cgi-bin/webscr,这里我们用测试的地址进行测试             string actionUrl = "https://www.sandbox.paypal.com/cgi-bin/webscr";StringBuilder sbHtml = new StringBuilder();sbHtml.Append("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />");sbHtml.Append("<form id='paypalsubmit' name='alipaysubmit' action='" + actionUrl + "' method='" + strMethod.ToLower().Trim() + "'>");foreach (KeyValuePair<string, string> temp in dicPara){sbHtml.Append("<input type='hidden' name='" + temp.Key + "' value='" + temp.Value + "'/>");}//submit按钮控件请不要含有name属性sbHtml.Append("<input type='submit'  style='display:none;'></form>");sbHtml.Append("<script>document.forms['paypalsubmit'].submit();</script>");return sbHtml.ToString();}

          string item_number = CFun.RequestPamStr("item_number"); //商品编号string pay_order = CFun.RequestPamStr("tx"); //paypal交易编号string pay_status = CFun.RequestPamStr("st"); //交易状态

            string response=ValidateSource();if (response == "VERIFIED")  //信息验证成功{string sendData = response;string item_number = CFun.RequestPamStr("item_number"); //商品编号string pay_order = CFun.RequestPamStr("txn_id"); //paypal交易编号string pay_status = CFun.RequestPamStr("payment_status"); //交易状态ErrorLog.sendLog(new Exception(),"商品编号："+item_number+";交易编号："+pay_order+"交易状态："+pay_status);if (pay_status == "Completed") //付款成功{//业务处理}Response.Write(sendData);}

 /// <summary>/// 验证返回地址是否是官方返回/// </summary>/// <returns></returns>private string  ValidateSource(){//Post back to either sandbox or livestring strSandbox = "https://www.sandbox.paypal.com/cgi-bin/webscr";string strLive = "https://www.paypal.com/cgi-bin/webscr";//System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; //Framework4.5支持ServicePointManager.SecurityProtocol = (SecurityProtocolType)192 | (SecurityProtocolType)768 | (SecurityProtocolType)3072; //4.0写法HttpWebRequest req = (HttpWebRequest)WebRequest.Create(strSandbox);//Set values for the request backreq.Method = "POST";req.ContentType = "application/x-www-form-urlencoded";byte[] param = Request.BinaryRead(HttpContext.Current.Request.ContentLength);string strRequest = Encoding.ASCII.GetString(param);string ipnPost = strRequest;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 responseStreamWriter 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();return strResponse;}