title: Prevent a Telegram bot from being added to any group or channel (allow adding it to whitelisted groups/channels)
body: <p>As far as I read the Telegram Bot API's docs, Telegram do not limit the calls to your webhook callback in any way.</p>
  
  <p>I am creating a Telegram Bot that will be available only for groups and channels that I will whitelist.</p>
  
  <p>I can filter out the messages I get in my webhook callback. However, a malicious user can add my bot to a thousand big groups and will possibly result in denial of service for all other users.</p>
  
  <p>Even if Telegram have implemented some rate limiting such user actions may still result in denial of service for all other users.</p>
  
  <p><strong>How can I specify the groups and the channels a Telegram bot can be added to.</strong></p>