$merchantPrivateKey = PemUtil::loadPrivateKey($wechatConfig['key_path']); // 商户私钥文件路径
var_export($merchantPrivateKey);
$wechatpayCertificate = PemUtil::loadCertificate($wechatConfig['cert_path']); // 微信支付平台证书文件路径
var_export($wechatpayCertificate);die;