How to provide redirect URL after successful PayPal transaction between two different users

I have a site where users can list items for purchase using PayPal but the PayPal transactions themselves are only between the two users (buyer and seller) and I, as the site owner, am not involved in any way.

Basically the buyer hits a buy button and the site redirects them to a PayPal checkout with the seller's PayPal name filled in. Pretty standard stuff.

But is it possible for me to provide a redirect URL so that the buyer is redirected back to some page on my site upon successful checkout? I know it's possible to do if I were the seller in this situation and I enabled Auto-Return in my account's settings but is it possible if I'm not involved in the transaction (outside of providing the checkout URL)?

Thanks!