code: public String qrPay(String orderNumber){
          QrPayRequest request = new QrPayRequest();
          request.setBody("测试订单");
          request.setClientIp("127.0.0.1");
          request.setTotalFee(1);
          request.setNotifyUrl(payNotifyUrl);
          request.setOutTradeNo(orderNumber);
          request.setTimeStart(Dates.now("yyyyMMddHHmmss"));
          return wepay.pay().qrPay(request).getCodeUrl();
      }
docs: 动态二维码支付
  @param orderNumber 订单号
  @return 二维码链接