微信Native支付接入教程（2022简洁版）

PC网站接入支付

微信支付支持完成域名ICP备案的网站接入支付功能。PC网站接入支付后，可以通过JSAPI支付或Native支付，自行开发生成二维码，用户使用微信“扫一扫”来完成支付。本次讲解Native支付的快捷接入教程。

接入文档网站：PC网站 - 微信支付接入指引 - 微信支付商户平台

一、简介

Native支付是指商户系统按微信支付协议生成支付二维码，用户再用微信“扫一扫”完成支付的模式。

应用场景

Native支付适用于PC网站、实体店单品或订单、媒体广告支付等场景

用户扫描商户展示在各种场景的二维码进行支付，具体操作流程如下：

步骤一商户根据微信支付的规则，为不同商品生成不同的二维码（如图3.1），展示在各种场景，用于用户扫描购买。

步骤二用户使用微信“扫一扫”（如图3.2）扫描二维码后，获取商品支付信息，引导用户完成支付（如图3.3）。

步骤三用户确认支付，输入支付密码（如图3.4）。

步骤四支付完成后会提示用户支付成功（如图3.5），商户后台得到支付成功的通知，然后进行发货处理。

二、接入微信支付前需要准备的参数

appid 微信公众号、小程序、app或开放平台的唯一标识；mchid 微信支付分配的商户收款账号；mchSerialNo：商户证书序列号； privateKey 私钥文件
apiKey3 交易过程生成签名的apiv3密钥；

三、java版本代码实现步骤

1、初始化httpClient

public CloseableHttpClient httpClient(){String keyPath = WChantPay.keyPath;String mchid = WChantPay.mchid;String mchSerialNo = WChantPay.mchSerialNo;String apiKey3 = WChantPay.apiKey3;try{// 加载商户私钥（privateKey：私钥字符串）//示例：私钥存储在文件PrivateKey merchantPrivateKey = PemUtil.loadPrivateKey(new FileInputStream("C:\\Users\\Administrator\\Desktop\\1626431593_20220528_cert\\apiclient_key.pem"));//PrivateKey merchantPrivateKey = PemUtil// .loadPrivateKey(new ByteArrayInputStream(keyPath.getBytes("utf-8")));// 加载平台证书（mchId：商户号,mchSerialNo：商户证书序列号,apiV3Key：V3密钥）AutoUpdateCertificatesVerifier verifier = new AutoUpdateCertificatesVerifier(new WechatPay2Credentials(mchid, new PrivateKeySigner(mchSerialNo, merchantPrivateKey)),apiKey3.getBytes("utf-8"));WechatPayHttpClientBuilder builder = WechatPayHttpClientBuilder.create().withMerchant(mchid, mchSerialNo, merchantPrivateKey).withValidator(new WechatPay2Validator(verifier));
// 初始化httpClientCloseableHttpClient httpC =  builder.build();return httpC;} catch (UnsupportedEncodingException e) {e.printStackTrace();}catch (IOException e) {e.printStackTrace();}return null;}

2、Native下单

public String CreateOrder() throws Exception{HttpPost httpPost = new HttpPost("https://api.mch.weixin.qq.com/v3/pay/transactions/native");// 请求body参数ByteArrayOutputStream bos = new ByteArrayOutputStream();ObjectMapper objectMapper = new ObjectMapper();ObjectNode rootNode = objectMapper.createObjectNode();//商户idrootNode.put("mchid", WChantPay.mchid)//小程序id.put("appid", WChantPay.appid)//描述.put("description", "wudehua")//微信通知回调地址.put("notify_url", "http://119.29.28.29/")//商户订单id.put("out_trade_no", "12345671");//如果前端直接传的是分此处不需要再转//int round = Math.round(wxpayDetail.getTotal() * 100);rootNode.putObject("amount")//支付金额，单位是（分）.put("total", 10);objectMapper.writeValue(bos, rootNode);httpPost.addHeader("Accept", "application/json");httpPost.addHeader("Content-type","application/json; charset=utf-8");httpPost.setEntity(new StringEntity(bos.toString("UTF-8")));//完成签名并执行请求CloseableHttpResponse response = httpClient().execute(httpPost);try {int statusCode = response.getStatusLine().getStatusCode();if (statusCode == 200) { //处理成功System.out.println("success,return body = " + EntityUtils.toString(response.getEntity()));return EntityUtils.toString(response.getEntity());} else if (statusCode == 204) { //处理成功，无返回BodySystem.out.println("success");return null;} else {System.out.println("failed,resp code = " + statusCode+ ",return body = " + EntityUtils.toString(response.getEntity()));throw new IOException("request failed");}} finally {response.close();}}

3、【客户端】生成支付二维码

这一步在客户端实现，可以利用qrcode.js进行实现二维码的生成；

4、查询订单

public void QueryOrder() throws Exception {//请求URLURIBuilder uriBuilder = new URIBuilder("https://api.mch.weixin.qq.com/v3/pay/transactions/id/4200000745202011093730578574");uriBuilder.setParameter("mchid", mchId);//完成签名并执行请求HttpGet httpGet = new HttpGet(uriBuilder.build());httpGet.addHeader("Accept", "application/json");CloseableHttpResponse response = httpClient().execute(httpGet);try {int statusCode = response.getStatusLine().getStatusCode();if (statusCode == 200) {System.out.println("success,return body = " + EntityUtils.toString(response.getEntity()));} else if (statusCode == 204) {System.out.println("success");} else {System.out.println("failed,resp code = " + statusCode+ ",return body = " + EntityUtils.toString(response.getEntity()));throw new IOException("request failed");}} finally {response.close();}
}

5、关闭订单

public void CloseOrder() throws Exception {//请求URLHttpPost httpPost = new HttpPost("https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/sdkphp12345678920201028112429/close");//请求body参数String reqdata ="{\"mchid\": \""+mchId+"\"}";StringEntity entity = new StringEntity(reqdata,"utf-8");entity.setContentType("application/json");httpPost.setEntity(entity);httpPost.setHeader("Accept", "application/json");//完成签名并执行请求CloseableHttpResponse response = httpClient().execute(httpPost);try {int statusCode = response.getStatusLine().getStatusCode();if (statusCode == 200) {System.out.println("success,return body = " + EntityUtils.toString(response.getEntity()));} else if (statusCode == 204) {System.out.println("success");} else {System.out.println("failed,resp code = " + statusCode+ ",return body = " + EntityUtils.toString(response.getEntity()));throw new IOException("request failed");}} finally {response.close();}}

简单单五步搞定微信支付，不懂的可以评论区留言，我会一一回复。

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