Best option is to go to your bank and set up a separate account and link that to your PP. Don't keep any money in there incase someone hacks your account they can't get to any more money than what you have in your PP. When you need to do a transfer, use online banking, transfer into that account then into your PP.
Thats what I did. Just made another account. Usually I have cash on hand in my PP account for purchases, but it's more or less for my deposits that I make into my bank account from my PP account.
Yeah, can be too safe when it comes to money and this freaky online world.