He signed up and submitted the verification form, however I was already off-line for the day so he was going to have to wait until the next morning. When I got online to process verifications for the day I saw there was already an "unauthorized" dispute for his payment.
I contacted him telling him he had to cancel the dispute or he'll get banned. He replied back with "no, ban me" so I did.
I'm not sure if it was a stolen PP account or not, but he obviously has no problems disputing legit payments for no reason. My guess is if you boost for him, he'll dispute the payment against you too once you're done.