odd_job/app/admin/controller/Index.php

<?php

namespace app\admin\controller;

use WeChatPay\Builder;
use WeChatPay\Crypto\Rsa;
use WeChatPay\Transformer;
use WeChatPay\Util\PemUtil;

class Index
{
    public function index()
    {
        return redirect('/admin.php/home');
    }

    public function t1()
    {
        // 商户号
        $merchantId = config('wxconfig.payMchId');

// 从本地文件中加载「商户API私钥」，「商户API私钥」会用来生成请求的签名
        $merchantPrivateKeyFilePath = file_get_contents(root_path('/extend/wechat-del/cert') . 'apiclient_key.pem');
        $merchantPrivateKeyInstance = Rsa::from($merchantPrivateKeyFilePath, Rsa::KEY_TYPE_PRIVATE);

// 「商户API证书」的「证书序列号」
        $merchantCertificateSerial = config('wxconfig.serial');

// 从本地文件中加载「微信支付平台证书」，用来验证微信支付应答的签名
        $platformCertificateFilePath = file_get_contents(root_path('/extend/wechat-del/cert') . 'apiclient_cert.pem');
        $platformPublicKeyInstance   = Rsa::from($platformCertificateFilePath, Rsa::KEY_TYPE_PUBLIC);

// 从「微信支付平台证书」中获取「证书序列号」
        $platformCertificateSerial = PemUtil::parseCertificateSerialNo($platformCertificateFilePath);

// 构造一个 APIv3 客户端实例
        $instance = Builder::factory([
            'mchid'      => $merchantId,
            'serial'     => $merchantCertificateSerial,
            'privateKey' => $merchantPrivateKeyInstance,
            'certs'      => [
                $platformCertificateSerial => $platformPublicKeyInstance,
            ],
        ]);

// 发送请求
        $resp = $instance->chain('v3/certificates')->get(
            ['debug' => true] // 调试模式，https://docs.guzzlephp.org/en/stable/request-options.html#debug
        );
        halt($resp->getBody());

    }
}