code: private Map<String, Object> doJsPay(JsPayRequest request, TradeType tradeType){
          Map<String, String> payParams = buildPayParams(request, tradeType);
          payParams.put(WepayField.OPEN_ID, request.getOpenId());
          return doPay(payParams);
      }
docs: JS支付
  @param request 支付信息
  @return 支付结果