If you are unsure or skeptical about using PayPal for AppWorld:
Just browsing the forums since the speak of app world using paypal, people have gotten a bit nervous about this.
I for one have not a problem with paypal, I just think RIM should have set this up through a different method, but thats a different stone.
If you're worried about your credit information being used over paypal
simply:
Go to your local grocery store
Pick up a prepaid Visa/Mastercard Credit/Debit card
Load your selected amount onto the card. 5$ 10$ 20$ etc etc
Create your paypal account with the "prepaid" debit/credit card.
If your card was ever lost/stolen/ etc. It wouldn't burden your financial life and economic status.
I'm sure there may be other ways, but this one is pretty much fool proof.
And if something were to ever happen to your prepaid card, there is still fraud prevention on most. So, do a little research and a bit of homework and you'll be able to use appworld with the piece of mind that you'd like.
I haven't used this method personally But Let me google that for you
Seems paypal may as well have prepaid methods.