code: @RequestMapping("/paid")
      public String paid(HttpServletRequest request){
  
          String notifyXml = getPostRequestBody(request);
          if (notifyXml.isEmpty()){
              return wepaySupport.notifyNotOk("body为空");
          }
  
          Map<String, Object> notifyParams = Maps.toMap(notifyXml);
  
          if (wepaySupport.verifySign(notifyParams)){
  
              // TODO business logic
  
              logger.info("verify sign success: {}", notifyParams);
  
              return wepaySupport.notifyOk();
          } else {
  
              logger.error("verify sign failed: {}", notifyParams);
              return wepaySupport.notifyNotOk("签名失败");
          }
      }
docs: 支付成功通知
  @param request 请求对象
  @return 处理结果