How to make multiple categories in Telegram bot, (node-telegram-bot-api)?

Question

Node.js

I'm creating a bot, rummaged through a bunch of sites, I didn't find anything sensible, mb you tell me.
The script should be like this:
Catalog(button) -> Enter product number -> Payment
How to make the processing so that when a person enters the product number, the payment is made only if he is in the product catalog. I use node-telegram-bot-api

bot.onText(/Посмотреть каталог/g, (msg) => {
        bot.sendMessage(msg['chat']['id'], catalog)
        bot.onText(/\d/, (msg)=> sendPaynament)
    });

But the second onText method works everywhere, moreover, when a person clicks on "View catalog" several times, the second onText method fires not once, but several times.
How to avoid this, is there any utility for working with several categories?