新注册商户没有证书，请问下这个开发指引中的httpClient能用公钥吗？如果可以的话怎么改，如果不可以的话有什么解决办法？谢谢 private CloseableHttpClient httpClient; private CertificatesManager certificatesManager; private Verifier verifier; @Before //initialize verifier and build httpClient public void setup() throws GeneralSecurityException, IOException, HttpCodeException, NotFoundException { PrivateKey merchantPrivateKey = PemUtil.loadPrivateKey(privateKey); certificatesManager = CertificatesManager.getInstance(); certificatesManager.putMerchant(merchantId, new WechatPay2Credentials(merchantId, new PrivateKeySigner(merchantSerialNumber, merchantPrivateKey)), apiV3Key.getBytes(StandardCharsets.UTF_8)); verifier = certificatesManager.getVerifier(merchantId); WechatPayHttpClientBuilder builder = WechatPayHttpClientBuilder.create() .withMerchant(merchantId, merchantSerialNumber, merchantPrivateKey) .withValidator(new WechatPay2Validator(verifier)); httpClient = builder.build(); }

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