/start – Begin,
/stop – Done.

Also:
Send a sticker to this bot – it will return the sticker’s rating based on other people’s votes. When sending stickers in a group, please make sure that your sticker is a _reply_ to one of the bot’s messages, otherwise it will not get it.

If you like a sticker so much that you’d like to use it on Telegram, double tap it and press ‘Add’ to see the respective sticker set.