use gift payment method
works 4 me.
They can include a note saying "This money is payment for nothing just a gift"
Then whatever their dispute is will be voided, because they stated it wasn't for an item and a dispute is always for a item that was not received.
U re safe with pp as long as the guy that pay you has a bankfunded paypal acc, and if he uses the gift method.
But yeah for big amounts(100+) just use WU

