Scam the Scammer

Does anyone know how to get personal information from a WhatsApp number for a guy in the Philippines? I could probably get him to click a link or something along those lines if that is something that helps? 
This guy I thought was a friend ended up taking money from me. At one point it would just be a charity thing - but since he was a bit of a dick - I'd like to get him back. Worst case scenario I'll do the Chewbacca prank with his phone number but curious if any of you are able to support me here?