How to make authorization in Wi-Fi using Mikrotik and an external server?

Question

WiFi

I want the following: to authorize clients in a Wi-Fi network through an html page. Use Mikrotik for this.
But I want to make this html page not in Mikrotik, but on an external server. Those. make it like a captive portal. In order for Mikrotik to redirect to this page on the server when the client connects, the client performs certain actions, the server responds to Mikrotik "everything is ok, give the Internet to the user!", And the user's Internet works.
There is a VDS on ubuntu, and I want to do it on it.
How difficult is it and how is it done in general?

Answer 1

it just googles with a bang.
Google request "Captive Portal Miktorik"
You can also watch a lecture by Roman Kozlov, he sets everything up and shows it live