Yes, it’s possible to use certain methods from the main Telegram API with your bot, but there are specific requirements. You need to make sure that the method you want to use is marked with the note “Bots can use this method.”
For example, you can see this note on the channels.editAdmin method. Only methods with this designation can be accessed by bots directly through the main Telegram API.
To use these methods, you’ll need to work with Telegram’s MTProto protocol, which is Telegram’s core protocol for client-server communication. This is different from the simpler Telegram Bot API (the HTTP-based API that most bot developers are familiar with). MTProto is more complex but allows access to features that aren’t available through the standard Bot API.
There are several libraries for various programming languages that support MTProto, which can help simplify the implementation process. By using an MTProto library, you can directly call the necessary Telegram API methods and unlock functionality that’s usually out of reach with just the Bot API.
Example libraries: