config = new RSAAutoCertificateConfig.Builder()
        .merchantId(WxPayProperties.getMerchantId())
        .privateKeyFromPath(WxPayProperties.getPrivateKeyPath())
        .merchantSerialNumber(WxPayProperties.getMerchantSerialNumber())
        .apiV3Key(WxPayProperties.getApiV3Key())
        .build();

自动获取平台证书为空，导致后续发起支付，验签失败，请问各位该如何处理