wechatpay-nextjs-v3/docs/transactions_h5.md

微信支付v3版本工具包Next.js版本

## h5 支付
```bash
import WxPay from 'wechatpay-node-v3';
import fs from 'fs';

const pay = new WxPay({
  appid: '直连商户申请的公众号或移动应用appid',
  mchid: '商户号',
  publicKey: fs.readFileSync('./apiclient_cert.pem'), // 公钥
  privateKey: fs.readFileSync('./apiclient_key.pem'), // 秘钥
});
```

## serial_no获取
1. 请在命令窗口使用 `openssl x509 -in apiclient_cert.pem -noout -serial` 获取
2. 调用方法`getSN()` // 不传入参数默认创建对象时的publicKey
```bash
console.log('获取序列号', pay.getSN()); 
或者
console.log('获取序列号', pay.getSN(fs.readFileSync('./apiclient_cert.pem'))); 
```
## 使用
```bash
const params = {
    description: '测试',
    out_trade_no: '订单号',
    notify_url: '回调url',
    amount: {
      total: 1,
    },
    scene_info: {
      payer_client_ip: 'ip',
      h5_info: {
        type: 'Wap',
        app_name: '网页名称 例如 百度',
        app_url: '网页域名 例如 https://www.baidu.com',
      },
    },
  };
  console.log(params);
  const result = await pay.transactions_h5(params);
  console.log(result);
  # 返回
  # {
  # status: 200,
  # h5_url: 'https://wx.tenpay.com/cgi-bin/mmpayweb-bin/checkmweb?prepay_id=wx051840206120147833cf4bcfcef12b0000&package=2056162962'
  # }
```

## 回调解密 （支付成功通知 退款通知）
```bash
# key 用商户平台上设置的APIv3密钥【微信商户平台—>账户设置—>API安全—>设置APIv3密钥】，记为key；
const result = pay.decipher_gcm(ciphertext, associated_data, nonce, key);
# 返回
# {
#   mchid: '商户号',
#   appid: 'appid',
#   out_trade_no: '1610419296553',
#   transaction_id: '4200000848202101120290526543',
#   trade_type: 'NATIVE',
#   trade_state: 'SUCCESS',
#   trade_state_desc: '支付成功',
#   bank_type: 'OTHERS',
#   attach: '',
#   success_time: '2021-01-12T10:43:43+08:00',
#   payer: { openid: '' },
#   amount: { total: 1, payer_total: 1, currency: 'CNY', payer_currency: 'CNY' }
# }
```

## 申请退款 （这里只是普通订单退款 合单支付商户号不支持 以后可以测试会补上）
```js
const params = {
    out_trade_no: '1615171309328',
    out_refund_no: '1615171380622',
    reason: '测试',
    amount: {
      refund: 1,
      total: 1,
      currency: 'CNY',
    },
  };
  console.log(params);
  const result = await pay.refunds(params);
  console.log(result);
```
## 查询退款
```js
 const result = await pay.find_refunds('1615171380622');
  console.log(result);
```