docs: public void marshall(DefaultPushNotificationMessage defaultPushNotificationMessage, ProtocolMarshaller protocolMarshaller) {
  
          if (defaultPushNotificationMessage == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(defaultPushNotificationMessage.getAction(), ACTION_BINDING);
              protocolMarshaller.marshall(defaultPushNotificationMessage.getBody(), BODY_BINDING);
              protocolMarshaller.marshall(defaultPushNotificationMessage.getData(), DATA_BINDING);
              protocolMarshaller.marshall(defaultPushNotificationMessage.getSilentPush(), SILENTPUSH_BINDING);
              protocolMarshaller.marshall(defaultPushNotificationMessage.getSubstitutions(), SUBSTITUTIONS_BINDING);
              protocolMarshaller.marshall(defaultPushNotificationMessage.getTitle(), TITLE_BINDING);
              protocolMarshaller.marshall(defaultPushNotificationMessage.getUrl(), URL_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }