Yep :)

You first create a bot, then join a chat with that bot, then control the bot via the http api

api: https://core.telegram.org/bots/api

quickstart (just to send messages, not mine): https://gist.github.com/dideler/85de4d64f66c1966788c1b2304b9...

Telegram actually has full-featured APIs, allowing you to implement both bots and custom clients! You can start here: https://core.telegram.org/ . Unfortunately, I don't have the direct link to the single-curl-request.