code: private SnsMessage.Builder<? extends SnsMessage.Builder> unmarshallUnsubscribeConfirmation(SnsJsonNode message) {
          return SnsUnsubscribeConfirmation.builder(client)
                                           .withMessage(message.getString(MESSAGE))
                                           .withSubscribeUrl(message.getString(SUBSCRIBE_URL))
                                           .withToken(message.getString(TOKEN));
      }
docs: Unmarshall into a {@link SnsUnsubscribeConfirmation} object.
  
  @param message JSON message.
  @return Builder with sub properties filled in. Base properties are added by
  {@link #unmarshallBase(SnsMessage.Builder, SnsJsonNode)}.