Bot API 8.3

Video Improvements
• Introduced support for custom covers and start timestamps for videos.
• Out of the box, bots can specify a cover and start timestamp when sending, editing and forwarding videos — including in albums and paid media.

Gifts and Reactions
• Bots can now send gifts to channels, in addition to regular users.
• Added support for transactions with chats.
• Bots can now add reactions to most service messages.

Similar Bots
• A list of similar bots will now appear in bot profiles, helping users discover other bots they may find interesting.

• And more, see the full changelog for details:

https://core.telegram.org/bots/api-changelog#february-12-2025