How to get charged when buying apps?

My dad recently bought an app from his iphone and i was just wondering, how does he get charged? It didn't ask for a credit card number or anything or does he have to pay in cash somewhere? I know i sound pretty stupid right now but both of us never bought an app before so how does he get charged? Sorry for quite a dumb question.

It will show.99 centers or 1.99 on the credit card, etc

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