title: How to get a Telegram Channel Id without sending a message to it
body: <p>Is there any way to find a telegram channel id without sending a message to it ?</p>
  <p>Right now I go this way and find the channel id by calling this URL in my code and get the JSON as result:
  <code>https://api.telegram.org/bot???????/sendMessage?chat_id=@?????&amp;text=123</code></p>
  <p>However, this cause sending the message &quot;123&quot; to the channel which is not good.</p>