Login mode only. New text of the button in forwarded messages.
If set to true, Telegram will automatically authorize the user.
Login mode only. Pass True to request the permission for your bot to send messages to the user.
Label text on the button.
HTTP or tg:// url to be opened.
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Login mode only. Username of a bot, which will be used for user authorization. If not specified, the current bot's username will be assumed. The url's domain must be the same as the domain linked with the bot.