How to buy a game with someone elses credit card?

I'm trying to buy a game on the app store (iphone) but my own debit card is logged in. I never put money on my debit card. So my mom just told me to give her the money and she will buy it on her card… Problem is where do i put her card in at? It always automatically charges to my card

It should have an option to add another card i don't really no a Lot about i phone's but i know on Google play you can add multiple cards hope this helps

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