Pay per View Plugin usage query

I notice Pay Per View asks us to turn on Auto Return to use PDT ... and fill in the url you have given which looks like this:

http://mysite.com/wp-admin/admin-ajax.php?action=ppw_paypal_ipn

But if I do this will it affect the return URL of other Paypal buttons I have on my site which are not under Pay Per View? For instance I have a "Thank you page" of my own as the URL in the auto return field. What will happen if I use the URL you specify?

The other Paypal buttons I have created are for people who want to buy my consulting services (as a one-time payment or recurring payment), whereas I am using Pay Per View plugin for people who want to view my video courses.

Should I use Pay Per View for all payments to avoid this Return URL issue? If so how would this work?

What is your advice on multiple usages of Paypal buttons of different kinds?