create multiple custom logins for clients

First time poster so please be kind- I’m not sure if this is the right place to post this.

I have a question about using my WordPress website to create a custom page for clients.

In an ideal world I would be able to:

– Have a client buy my product through the website, create a custom username for them, and let them create a password.
-Send them to a specific page that they could log into with that username and password (but also other clients could login to with their different usernames and passwords)
– Once they enter their correct username and password they would then be redirected to the page the product is on.

Can anyone tell me if there is a way to do that? Is there a plugin or another way to allow multiple clients to access a single page? I didn’t think I could do this with the usual subscriber login because then any subscriber – even those who haven’t bought the product could theoretically access the page.

Any information on if this is even possible is appreciated! Thanks!