Since subscriptions are handled by Apple's App Store, all payments are made from the card linked to your Apple ID. To update your payment method on your iPhone:
- Open the Settings app.
- Tap your name.
- Tap Payment & Shipping. You might be asked to sign in with your Apple ID.
- From here, you can do the following:
- Add a payment method — Tap Add Payment Method.
- Update a payment method — Tap the payment method, then edit your information. You might need to enter the security code that's printed on your credit or debit card.
- Remove a payment method — Tap Edit, tap the red Delete button, then tap Remove.
For more help with updating your payment method click HERE