use GuzzleHttp\Exception\RequestException;
use WechatPay\GuzzleMiddleware\WechatPayMiddleware;
use WechatPay\GuzzleMiddleware\Util\PemUtil;
use GuzzleHttp\HandlerStack;
 
// 商戶相關(guān)配置，
$merchantId = '1000100'; // 商戶號(hào)
$merchantSerialNumber = 'XXXXXXXXXX'; // 商戶API證書序列號(hào)
$merchantPrivateKey = PemUtil::loadPrivateKey('./path/to/mch/private/key.pem'); // 商戶私鑰文件路徑
 
// 微信支付平臺(tái)配置
$wechatpayCertificate = PemUtil::loadCertificate('./path/to/wechatpay/cert.pem'); // 微信支付平臺(tái)證書文件路徑
 
// 構(gòu)造一個(gè)WechatPayMiddleware
$wechatpayMiddleware = WechatPayMiddleware::builder()
    ->withMerchant($merchantId, $merchantSerialNumber, $merchantPrivateKey) // 傳入商戶相關(guān)配置
    ->withWechatPay([ $wechatpayCertificate ]) // 可傳入多個(gè)微信支付平臺(tái)證書，參數(shù)類型為array
    ->build();
 
// 將WechatPayMiddleware添加到Guzzle的HandlerStack中
$stack = GuzzleHttp\HandlerStack::create();
$stack->push($wechatpayMiddleware, 'wechatpay');
 
// 創(chuàng)建Guzzle HTTP Client時(shí)，將HandlerStack傳入，接下來，正常使用Guzzle發(fā)起API請(qǐng)求，WechatPayMiddleware會(huì)自動(dòng)地處理簽名和驗(yàn)簽
$client = new GuzzleHttp\Client(['handler' => $stack]);

/*
    Package core 微信支付api v3 go http-client 基礎(chǔ)庫，你可以使用它來創(chuàng)建一個(gè)client，并向微信支付發(fā)送http請(qǐng)求
    只需要你在初始化客戶端的時(shí)候，傳遞credential以及validator
    credential用來生成http header中的authorization信息
    validator則用來校驗(yàn)回包是否被篡改
    如果http請(qǐng)求返回的err為nil，一般response.Body 都不為空，你可以嘗試對(duì)其進(jìn)行序列化
    請(qǐng)注意及時(shí)關(guān)閉response.Body
    注意：使用微信支付apiv3 go庫需要引入相關(guān)的包，該示例代碼必須引入的包名有以下信息

    "context"
    "crypto/x509"
    "fmt"
    "io/ioutil"
    "log"
    "github.com/wechatpay-apiv3/wechatpay-go/core"
    "github.com/wechatpay-apiv3/wechatpay-go/core/option"
    "github.com/wechatpay-apiv3/wechatpay-go/utils"

    */
func SetUp() (opt []option.ClientOption, err error) {
    //商戶號(hào)
    mchID := ""
    //商戶證書序列號(hào)
    mchCertSerialNumber := ""
    //商戶私鑰文件路徑
    privateKeyPath := ""
    //平臺(tái)證書文件路徑
    wechatCertificatePath := ""

    // 加載商戶私鑰
    privateKey, err := utils.LoadPrivateKeyWithPath(privateKeyPath)
    if err != nil {
        log.Printf("load private err:%s", err.Error())
        return nil, err
    }
    // 加載微信支付平臺(tái)證書
    wechatPayCertificate, err := utils.LoadCertificateWithPath(wechatCertificatePath)
    if err != nil {
        log.Printf("load certificate err:%s",err)
        return nil, err
    }
    //設(shè)置header頭中authorization信息
    opts := []option.ClientOption{
        option.WithMerchant(mchID, mchCertSerialNumber, privateKey), // 設(shè)置商戶相關(guān)配置
        option.WithWechatPay([]*x509.Certificate{wechatPayCertificate}), // 設(shè)置微信支付平臺(tái)證書，用于校驗(yàn)回包信息用
    }
    return opts, nil
}