When making a credit card payment,The formal environment can be returned normally.(sensitive information has been modified):

Pay Result:{nonce_str=IcVsdgs22Fsz46s, appid=wx53c4sd87dcdc, sign=9B7AE9DD7sdfs126FC3CC095, err_code=USERPAYING, return_msg=OK, result_code=FAIL,  Err_code_des= requires user to enter payment password, mch _ id = 14857572, return _ code = success}

But the sandbox environment has been reporting errors, the result is as follows:

Pay Result:{return_msg= sandbox verification signature failed, please make sure sandbox signature key is correct (generated by getsignkey call), return_code=FAIL}

Tell me about the process I did

• Judging whether the current is a sandbox environment; If it is a formal environment, then the settings on the merchant platform will be used directly.KeyTo generate payment requestsSign; If it is a sandbox environment, first comehttps://api.mch.weixin.qq.com/sandboxnew/pay/getsignkeyTo requestsandbox_signkey, using the requestedsandbox_signkeyTo replace the settings on the merchant platformKeyTo generate what the request requiresSign, the main code is as follows (the method call retrieveSandboxSignKey code is also posted later):

  WXPayConfigImpl config = WXPayConfigImpl.getInstance();
   Boolean useSandbox = Boolean.valueOf(WxPropertiesUtil.getProperty("use_sandbox"));
   String key;
   if (useSandbox) {
   String sandboxSignkey = config.retrieveSandboxSignKey(config, wxPay);
   if (StringUtils.isBlank(sandboxSignkey)) {
   Createerrorwithmessage ("request sandbox sandbox_signkey failed");
   bracket
   key = sandboxSignkey;
   } else {
   key = config.getKey();
   bracket
   String sign = WXPayUtil.generateSignature(reqData, key, SignType.MD5);
   reqData.put("sign", sign);
   //    ...
   Map<String, String> result = wxPay.microPay(reqData);
   Info ("payresult:" add result.toString ()));

• The code to obtain the sandbox key is as follows

  public String retrieveSandboxSignKey(WXPayConfig config, WXPay wxPay) {
   try {
   Map<String, String> params = new HashMap<String, String>();
   params.put("mch_id", config.getMchID());
   params.put("nonce_str", WXPayUtil.generateNonceStr());
   params.put("sign", WXPayUtil.generateSignature(params, config.getKey()));
   String strXML = wxPay.requestWithoutCert("https://api.mch.weixin.qq.com/sandboxnew/pay/getsignkey",
   params, config.getHttpConnectTimeoutMs(), config.getHttpReadTimeoutMs());
   if (StringUtils.isBlank(strXML)) {
   return null;
   bracket
   Map<String, String> result = WXPayUtil.xmlToMap(strXML);
   Log.info ("retrievesandboxsignkey:" plus result ");
   if ("SUCCESS".equals(result.get("return_code"))) {
   return result.get("sandbox_signkey");
   bracket
   return null;
   } catch (Exception e) {
   Log.error ("get sandbox_signkey exception", e);
   return null;
   bracket
   bracket

I don’t know if there is any problem with this logic. The official document does not explain how this sandbox key should be used. I am looking up. Dear bosses, please take a look at this problem. Thank you very much.