How to change my credit card details on my iPhone 4s?

When I attempt to download an app it says you must verify your credit card details then it takes me to the payment info I filled in my details again and with no mistakes but it will say payment method declined. So I tried it with other credit cards but still won't do it. But for some reason I can't change the credit card which belongs to my bro.info back to my own. Before this all happened it worked perfectly. The address is correct too. But today it just won't let me download anything wether its free or not. Not even with my brothers card details and it won't save my own credit card details when I attempt to fill it in with my credit card Details. So it saves his but I don't want his credit details on my payment info

Could be apples own error, so wait a few days and try again. But you could go to settings, scroll down to Store, and tap on your apple id.tap the view apple id, put in your apple password and try your payment information again.

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