Before I get to deep into this... Does this exist already?

I'm going to start giving perks, extra videos, personal vlogs and reviews and Mumble server access to people who support me monetarily. I do have a Patreon, which you can support me on, but I've never really done much more than start one, only posted for a brief period and just sort not delete it. I've never made a fuss about it and I've been at the same level of support for more than a year which is basically just some monthy groecery income, which is nice, but I'd like to start earning more and I have some stuff to offer now. Obviously I'm not a big fan of Patreon's past behavior, I will use them if needbe, but I was curious about a server-side equivalent.

I'd like this: a service I can host on my own website that allows users to log in and will verify that they've donated X ammount in the last month by Zelle or Paypal or whatever. If so, it will give them access to extra content. As far as I'm concerned, this would be better than Patreon just because it cuts out the Middle Man.

It isn't too difficult to make password-protected content on a webserver, nor is it too hard to create usernames and passwords for people. I'm more thinking of if there is a service that can verify a payment.

If there's nothing quite like this and I can't come across a quick way to do it myself, I'll just end up using Patreon.

By the way, thanks to all of you who answered my previous question about redirecting traffic from a particular source. Apparently you can refer to a %{HTTP_REFERER} in a RewriteCond. I knew it was something obvious!