I need to change my credit card, since the one I had was used by somebody.

Hi etsuko257,

Sorry to hear that you had your card used by someone else, that's never good. But now that you have a new one, I would suggest following these steps to change your payment method to your new card!

Here's a quick rundown of the process:

1. Open the Settings app.
2. Tap your name.
3. Tap Payment & Shipping. You might be asked to sign in with your Apple ID.
4. Tap Add Payment Method, enter the new payment method, then tap Done.
5. Tap Edit.
6. Tap the red delete button next to the old payment method, then tap Delete.

This article below has more information if you're using your Mac or PC.

If you need to change or update your Apple ID payment method - Apple Support