Sometimes if you sell an item using paypal, then that person makes a claim against the transaction, paypal may make you refund the person, other times they may refund the person themselves, or let the transaction stand...it all depends. You would need to contact them to see what would happen.
By out the money...I am saying that there is a chance that paypal may end up deciding that you owe the person the money...and since it is a digital item, you would not be able to get it back(the person would claim they did not get it because someone else accessed their account or some bull crap like that).