How to find out/get the URL for registering a user to a role/status/group on a WP site?

Question

WordPress

It is required to insert a link to register on the WP site in different roles / statuses in letters to different people - can this be written in the URL?

With the help of some kind of membership wordpress plugin I will solve the problem with the restriction to view the pages of the site .. (by roles). But how do I give a link to register in a role?...