It shouldn't be a problem but I'd recommend putting your card back on file just in case... however, do you see a balance in your paypal account roughly the same as the refund? If yes, they couldn't find the card on file and instead refunded it back to your paypal account.... in that case, you'll need to find a way to withdraw the money - you can request a check, which takes 4 weeks. I've never tried withdrawing before so can't really comment.