igaming software developer
Slotegrator already provides solutions for creation of casinos based on Telegram bots.
what do you think about it? How they can integrate a payment systems? I dont understand
There are differences between Telegram API, Telegram bot and external bot with custom Telegram interface. I think, official Telegram bot does not support such payment system, but you could handle the payment system in your own web application and connect to Telegram via API and use the bot to spice things up.
User to System:
Users -> Telegram bot -> Your web application -> Payment system
System to User:
Payment system -> Your web application -> Telegram API -> [OPTIONAL] Telegram bot -> Users
That is my thought on this matter. Payment systems have their own tutorials to integrate them in web application. To develop a web application, I suggest using SpringBoot, which made my development time super quick.