代码 config = new RSAPublicKeyConfig.Builder() .merchantId(mchId) .privateKeyFromPath(filePath) .publicKeyId(publicKeyId) .publicKeyFromPath(publicFilePath) .merchantSerialNumber(merchantSerialNumber) .apiV3Key(apiV3Key) .build(); Config config = wxpayProperties.getConfig(); JsapiServiceExtension service = new JsapiServiceExtension.Builder().config(config)..build(); PrepayWithRequestPaymentResponse requestPaymentResponse = new PrepayWithRequestPaymentResponse(); PrepayRequest prepayRequest = new PrepayRequest(); prepayRequest.setAppid(wxpayProperties.getAppId()); prepayRequest.setMchid(wxpayProperties.getMchId()); prepayRequest.setDescription(subject); prepayRequest.setOutTradeNo(orderNo); prepayRequest.setNotifyUrl(wxpayProperties.getV3PayNotifyUrl()); Amount mount = new Amount(); mount.setCurrency("CNY"); BigDecimal multiply = amount.multiply(new BigDecimal(100)); mount.setTotal(multiply.setScale(0, RoundingMode.HALF_UP).intValue()); prepayRequest.setAmount(mount); Payer payer = new Payer(); payer.setOpenid(openId); prepayRequest.setPayer(payer); log.info("微信预下单，请求参数：{}", JSONUtil.toJsonStr(prepayRequest)); requestPaymentResponse = service.prepayWithRequestPayment(prepayRequest); 返回信息，部分数据使用了*代替 Wrong HttpStatusCode[500] httpResponseBody[{"code":"SYSTEM_ERROR","message":"未知错误"} ]   HttpRequest[{"http_method":"POST","url":"https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi","uri":"https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi","headers":{"headers":{"Authorization":"WECHATPAY2-SHA256-RSA2048 mchid=\"1700******0\",nonce_str=\"6GfW0Esv2FYyyYE095jiPMVhTCSse1Pk\",timestamp=\"1733290965\",serial_no=\"4925C486C56D110794D00FBE23B6C9B8BC1D9FD5\",signature=\"jDJBN1ZHvjGUGPtnxD27Aw0/HJFBagVGhDGenolTTj363p3MLNAaEI0RllConWzGBk6IG6amGFVsmtnZuvBtKN2S4JMEPTA0g2X2l7iIx5AZKy4PPgOoJAjCPvfP4SyMmXtlF0vEp4DmQNt1FGu1eeahEhIUBbAvSZJ6YJoMXEnGKIGYo6HGu3EWGc7 8WBA6SE5B3C8dalT7jmwPeLBJDeLrmRUEPaOJ8Clp1e2GJIzq0sdZpqUHazwNqPNYBIMLcKhj6WEAjX lVdKJaMFTswACxGpeTJZN9jRaVjgMnRIHTv 5XEADgeodXCZ7qK/1gPEo9bgb0vRalINqNc3rw==\"","Accept":"application/json","User-Agent":"WechatPay-Java/0.2.15 (Windows 11/10.0) Java/21.0.2 Credential/WechatPay2Credential Validator/WechatPay2Validator okhttp3/null","Content-Type":"application/json","Wechatpay-Serial":"PUB_KEY_ID_01170008*********300558100000280;"}},"body":{"body":"{\"appid\":\"wxb45*******6\",\"mchid\":\"1700******0\",\"description\":\"第D9999期D级教练员培训-河北省秦皇岛市\",\"out_trade_no\":\"1864183526775812096\",\"notify_url\":\"http://5****n/wxpay/pay_notify\",\"amount\":{\"total\":1,\"currency\":\"CNY\"},\"payer\":{\"openid\":\"oqI*******M\"}}"}}]