From the next update with Midrub you will be able to publish posts and photos in Telegram Groups. Midrub uses the Telegram’s api but you don’t need to configure the Telegram Groups in Midrub. Just enable it and each user must create an application and bot for their Telegram account.
Telegram Groups don’t requires a callback. It’s simple and requires several minutes to create an application/bot and start to publish in Telegram Groups.