docs: public void card(String openId, String cardId, String from) {
          Map<String, Object> request = initMessage(openId, "wxcard", from);
          request.put("wxcard", new Card(cardId));
  
          String url = WxEndpoint.get("url.care.message.send");
          wxClient.post(url, JsonMapper.defaultMapper().toJson(request));
      }