I had some luck with paypal rebuking some one of my customer's "unauthorized charge" attempts. I had someone buy around $750 worth of BTC over the span of two months. One day I logged in and there were 60+ unauthorized charges from this person. I didn't refund the money, instead I waited so that paypal would have to review it. Turns out he was using his own account and marked all the charges as unauthorized, though paypal determined that the charges were legitimate and that no suspicious activity happened on his account. I was rather surprised. I'm not sure if it helped but my account is 9 years old, good standing, and a premium/business account.

At any rate, I'd like to get whitelisted if anyone can do so