/** {@inheritDoc} */
  public JsonValue convertToJson(ConfirmationCallback callback, int index) {

    String prompt = callback.getPrompt();
    int messageType = callback.getMessageType();
    String[] options = callback.getOptions();
    int optionType = callback.getOptionType();
    int defaultOption = callback.getDefaultOption();
    int selectedIndex = callback.getSelectedIndex();

    JsonValue jsonValue =
        JsonValueBuilder.jsonValue()
            .put("type", CALLBACK_NAME)
            .array("output")
            .add(createOutputField("prompt", prompt))
            .add(createOutputField("messageType", messageType))
            .add(createOutputField("options", options))
            .add(createOutputField("optionType", optionType))
            .addLast(createOutputField("defaultOption", defaultOption))
            .array("input")
            .addLast(createInputField(index, selectedIndex))
            .build();

    return jsonValue;
  }