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).
For the Google Play Store:
1. Credit and debit cards.
2. Mobile phone billing (supported carriers only).
3. Google Play gift cards.
4. Google Wallet (UK and USA only).
5. PayPal (certain countries).
IMPORTANT NOTE: Supported payment methods may differ from country to country. Check with Apple and Google Play tech support articles for more information.