Simple Keyboard

This bot shows a numeric keyboard when you send a "open" message and hides it when you send a "close":

package main

import (
	"log"

	"github.com/go-telegram-bot-api/telegram-bot-api"
)

var numericKeyboard = tgbotapi.NewReplyKeyboard(
	tgbotapi.NewKeyboardButtonRow(
		tgbotapi.NewKeyboardButton("1"),
		tgbotapi.NewKeyboardButton("2"),
		tgbotapi.NewKeyboardButton("3"),
	),
	tgbotapi.NewKeyboardButtonRow(
		tgbotapi.NewKeyboardButton("4"),
		tgbotapi.NewKeyboardButton("5"),
		tgbotapi.NewKeyboardButton("6"),
	),
)

func main() {
	bot, err := tgbotapi.NewBotAPI("MyAwesomeBotToken")
	if err != nil {
		log.Panic(err)
	}

	bot.Debug = true

	log.Printf("Authorized on account %s", bot.Self.UserName)

	u := tgbotapi.NewUpdate(0)
	u.Timeout = 60

	updates, err := bot.GetUpdatesChan(u)

	for update := range updates {
		if update.Message == nil {
			continue
		}
		msg := tgbotapi.NewMessage(update.Message.Chat.ID, update.Message.Text)

		switch update.Message.Text {
		case "open":
			msg.ReplyMarkup = numericKeyboard
		case "close":
			msg.ReplyMarkup = tgbotapi.NewRemoveKeyboard(true)
		}

		bot.Send(msg)
	}
}