code: public Boolean send(MessageTemplate template) throws UnirestException
      {
          String url = this.remote_url + this.configs.get("page_access_token", "");
          String body = template.build();
          Logger.info("curl -X POST -H \"Content-Type: application/json\" -d '" + body + "' \"" + url + "\"");
          HttpResponse<String> response = Unirest.post(url).header("Content-Type", "application/json").body(body).asString();
  
          return true;
      }
docs: Send Default Message
  
  @param  template an instance of message template
  @return Boolean whether the message sent or not
  @throws UnirestException Throws exception in case it fails to perform the request