const crypto = require('crypto');
const axios = require('axios');

class PatMallPayClient {
  constructor(merchantNo, apiSecret) {
    this.merchantNo = merchantNo; // 商户号（字符串，如：MCH17625364836767533）
    this.apiSecret = apiSecret; // API密钥Secret（32位MD5值，用于API请求和回调通知签名）
    this.baseUrl = 'http://127.0.0.1:8001';
  }

  // 生成签名
  generateSign(params) {
    // 过滤空值和sign字段
    const filteredParams = {};
    Object.keys(params).forEach(key => {
      if (key !== 'sign' && params[key] !== undefined && params[key] !== null && params[key] !== '') {
        filteredParams[key] = params[key];
      }
    });
    // 按ASCII码升序排序
    const sortedKeys = Object.keys(filteredParams).sort();
    const stringA = sortedKeys.map(k => `${k}=${filteredParams[k]}`).join('&');
    const stringSignTemp = `${stringA}&key=${this.apiSecret}`;
    return crypto.createHash('md5').update(stringSignTemp).digest('hex').toUpperCase();
  }

  // 创建订单
  async createOrder(orderData) {
    const params = {
      merchantNo: this.merchantNo,
      outTradeNo: orderData.outTradeNo, // 必填，商户订单号
      amount: orderData.amount,
      subject: orderData.subject,
      channelCode: orderData.channelCode, // 必填，通道编码
      timestamp: Math.floor(Date.now() / 1000)
    };
    
    // 可选参数（不为空时才添加）
    if (orderData.body) params.body = orderData.body;
    if (orderData.notifyUrl) params.notifyUrl = orderData.notifyUrl;
    if (orderData.returnUrl) params.returnUrl = orderData.returnUrl;

    params.sign = this.generateSign(params);

    const response = await axios.post(`${this.baseUrl}/open/pay/create`, params);
    return response.data;
  }

  // 查询订单
  async queryOrder(orderNo) {
    const response = await axios.post(`${this.baseUrl}/open/pay/query`, { orderNo });
    return response.data;
  }
}

// 使用示例
const client = new PatMallPayClient('MCH17625364836767533', 'YOUR_API_SECRET');

// 创建订单
const result = await client.createOrder({
  outTradeNo: 'MCH20231201001', // 必填，商户订单号
  amount: 1.00,
  subject: '测试商品',
  channelCode: 'wechat_native', // 必填，通道编码
  body: '商品详情',
  notifyUrl: 'https://your-domain.com/notify',
  returnUrl: 'https://your-domain.com/return'
});

console.log('支付链接:', result.data.paymentUrl);

<?php
class PatMallPayClient {
    private $merchantNo;
    private $apiSecret;
    private $baseUrl;

    public function __construct($merchantNo, $apiSecret) {
        $this->merchantNo = $merchantNo; // 商户号（字符串，如：MCH17625364836767533）
        $this->apiSecret = $apiSecret; // API密钥Secret（32位MD5值）
        $this->baseUrl = 'http://127.0.0.1:8001';
    }

    // 生成签名
    private function generateSign($params) {
        unset($params['sign']);
        // 过滤空值
        $params = array_filter($params, function($value) {
            return $value !== null && $value !== '';
        });
        ksort($params);
        $stringA = http_build_query($params);
        $stringSignTemp = $stringA . '&key=' . $this->apiSecret;
        return strtoupper(md5($stringSignTemp));
    }

    // 创建订单
    public function createOrder($orderData) {
        $params = [
            'merchantNo' => $this->merchantNo,
            'outTradeNo' => $orderData['outTradeNo'], // 必填，商户订单号
            'amount' => $orderData['amount'],
            'subject' => $orderData['subject'],
            'channelCode' => $orderData['channelCode'], // 必填，通道编码
            'timestamp' => time()
        ];
        
        // 可选参数（不为空时才添加）
        if (!empty($orderData['body'])) $params['body'] = $orderData['body'];
        if (!empty($orderData['notifyUrl'])) $params['notifyUrl'] = $orderData['notifyUrl'];
        if (!empty($orderData['returnUrl'])) $params['returnUrl'] = $orderData['returnUrl'];

        $params['sign'] = $this->generateSign($params);

        $ch = curl_init($this->baseUrl . '/open/pay/create');
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($params));
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'Content-Type: application/json'
        ]);

        $response = curl_exec($ch);
        curl_close($ch);

        return json_decode($response, true);
    }

    // 验证回调签名（使用apiSecret，与API请求签名方式相同）
    public function verifyNotify($notifyData, $apiSecret) {
        $sign = $notifyData['sign'];
        unset($notifyData['sign']);
        
        // 过滤空值
        $notifyData = array_filter($notifyData, function($value) {
            return $value !== null && $value !== '';
        });
        
        ksort($notifyData);
        $stringA = http_build_query($notifyData);
        $stringSignTemp = $stringA . '&key=' . $apiSecret;
        $calculatedSign = strtoupper(md5($stringSignTemp));

        return $sign === $calculatedSign;
    }
}

// 使用示例
$client = new PatMallPayClient('MCH17625364836767533', 'YOUR_API_SECRET');

$result = $client->createOrder([
    'outTradeNo' => 'MCH20231201001', // 必填，商户订单号
    'amount' => 1.00,
    'subject' => '测试商品',
    'channelCode' => 'wechat_native', // 必填，通道编码
    'body' => '商品详情',
    'notifyUrl' => 'https://your-domain.com/notify.php',
    'returnUrl' => 'https://your-domain.com/return.php'
]);

echo '支付链接: ' . $result['data']['paymentUrl'];
?>