code: public static void processReplyContent(MultipartBody multipartBody, ReplyingOptions replyingOptions) {
  
          if (replyingOptions.getReplyTo() != 0)
              multipartBody.field("reply_to_message_id", String.valueOf(replyingOptions.getReplyTo()), "application/json; charset=utf8;");
          if (replyingOptions.getReplyMarkup() != null) {
  
              switch (replyingOptions.getReplyMarkup().getType()) {
  
                  case FORCE_REPLY:
                      multipartBody.field("reply_markup", TelegramBot.GSON.toJson(replyingOptions.getReplyMarkup(), ForceReply.class), "application/json; charset=utf8;");
                      break;
                  case KEYBOARD_HIDE:
                      multipartBody.field("reply_markup", TelegramBot.GSON.toJson(replyingOptions.getReplyMarkup(), ReplyKeyboardHide.class), "application/json; charset=utf8;");
                      break;
                  case KEYBOARD_REMOVE:
                      multipartBody.field("reply_markup", TelegramBot.GSON.toJson(replyingOptions.getReplyMarkup(), ReplyKeyboardRemove.class), "application/json; charset=utf8;");
                      break;
                  case KEYBOARD_MARKUP:
                      multipartBody.field("reply_markup", TelegramBot.GSON.toJson(replyingOptions.getReplyMarkup(), ReplyKeyboardMarkup.class), "application/json; charset=utf8;");
                      break;
                  case INLINE_KEYBOARD_MARKUP:
                      multipartBody.field("reply_markup", TelegramBot.GSON.toJson(replyingOptions.getReplyMarkup(), InlineKeyboardMarkup.class), "application/json; charset=utf8;");
                      break;
              }
          }
      }
docs: This does generic processing of ReplyingOptions objects when sending a request to the API
  
  @param multipartBody     The MultipartBody that the ReplyingOptions content should be appended to
  @param replyingOptions   The ReplyingOptions that were used in this request