Identifier of the shared chat. The bot may not have access to the chat and could be unable to use this identifier, unless the chat is already known to the bot by some other means.
Optional
photoAvailable sizes of the chat photo, if the photo was requested by the bot
Identifier of the request
Optional
titleTitle of the chat, if the title was requested by the bot.
Optional
usernameUsername of the chat, if the username was requested by the bot and available.
This object contains information about a chat that was shared with the bot using a KeyboardButtonRequestChat button.