C#支付宝新版支付请求接口调用

using Aop.Api;
using Aop.Api.Domain;
using Aop.Api.Request;
using Aop.Api.Response;

public class newalipayconfig
{
 public newalipayconfig()
 {
  //
  // TODO: 在此处添加构造函数逻辑
  //
 }
 // 应用ID,您的APPID
 public static string app_id = "";
 
 // 支付宝网关
 public static string gatewayUrl = "https://openapi.alipay.com/gateway.do";
 
 // 支付宝公钥,查看地址：https://openhome.alipay.com/platform/keyManage.htm 对应APPID下的支付宝公钥。 
 public static string alipay_public_key = "";
            
 // 商户私钥，您的原始格式RSA私钥
 public static string private_key = "";
  
 // 签名方式
 public static string sign_type = "RSA2";
 
 // 编码格式
 public static string charset = "UTF-8";
}

DefaultAopClient client = new DefaultAopClient(newalipayconfig.gatewayUrl, newalipayconfig.app_id, newalipayconfig.private_key, "json", version, newalipayconfig.sign_type, newalipayconfig.alipay_public_key, newalipayconfig.charset, false);
 
  if (order != null)
  {
   // 支付中途退出返回商户网站地址
   string quit_url = "www.alipay.com";
 
   // 组装业务参数model
   AlipayTradeWapPayModel model = new AlipayTradeWapPayModel();
   model.Body = body; //商品描述
   model.Subject = subject; //商品名称
   model.TotalAmount = total_amount; ////订单总金额，单位为元，精确到小数点后两位，取值范围[0.01,100000000]
   model.OutTradeNo = out_trade_no; //商户网站唯一订单号
   model.ProductCode = "QUICK_WAP_WAY";//销售产品码，商家和支付宝签约的产品码。
   model.QuitUrl = quit_url;
 
   AlipayTradeWapPayRequest request = new AlipayTradeWapPayRequest();
   // 设置支付完成同步回调地址
   request.SetReturnUrl(AlipayConfig.Call_back_url);
   // 设置支付完成异步通知接收地址
   request.SetNotifyUrl(AlipayConfig.Notify_url);
   // 将业务model载入到request
   request.SetBizModel(model);
 
   AlipayTradeWapPayResponse response = null;
   try
   {
    response = client.pageExecute(request, null, "post");
    Response.Write(response.Body);
   }
   catch (Exception exp)
   {
    throw exp;
   }
  }