If you wish to create a Telegram integration with a public channel, then you'll need to simply find your "channel_id". This can be found on the web.telegram at the end of your channel URL or as an invite link in the app's "Channel type" settings (ex. "t.me/your_channel_id"). It must include the @ sign. (ex. @your_channel_id). Enter it in the corresponding field below.
Alternatively, if you wish to create an integration with a private channel, you'll need to add an ID Bot to your channel to find out your channel's ID (ex. -1001305673209). Enter it in the corresponding field below.