It's pretty straightforward - if you want to create a private, paywalled Telegram channel, InviteMember makes that pretty easy.

It's a bit expensive, and there's no free plan - that's dropped it to 4 stars - but overall I dig it. It's a hyper-specific, single-use tool that does it's job well.

As far as I know of, there aren't other tools that let you do the same thing, and a paid telegram channel is pretty niche, so I appreciate it's existence.