Purchases are processed by your app store, so you should use a payment method supported by that store.

For the App Store:
1. Credit and debit cards.
2. Content codes.
3. Store credit, including iTunes or Apple Music gift cards.
4. PayPal.
5. Alipay.
6. Mobile phone billing (supported carriers only).

IMPORTANT NOTE: Supported payment methods may differ from country to country. Check with Apple tech support articles for more information.