Can i buy things on apple app store with my credit instead of using a bank account?

I wanna buy something on the apple app store on my iphone but i wanna buy it with my credit instead of using a bank account, i was just wondering if this is possible if so how? I went on the internet and it said press the option 'none' but i did that and it doesn't work it just says that i need to update my purchase thing to buy something, its really annoying me now.

Link your Apple ID to a valid credit card.
http://store.apple.com/...p/payments

Whatever you want to buy, you should consider the budget and the goods quality, brand and specifacitons. I like to buy items online.before buying certain items, i will google at first, then i will contact the webmaster. After quirying severl times, i choose paypal methods. It is safe and good use. It is my experience.