Okay so, me and my brother used hid debit card to buy an app. I thought he had enough on there and so did he. Now i was able to download and use the app(Game Maker), But i had to reinstall snow leopard. Now i tried to install the app again but it said before i can download any apps even free ones, i need to verify my account info. Now when i enter the pin number for the debit card, it says "Enter a valid PIN" I Did I am 100% sure. Any help would be appreciated, i can't even download my recently purchased apps. I opened iTunes and it won't let me check "None" for the payment type. Can i remove the debit card or something?