Payment for App Store

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

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

Or -> Add a payment method to your Apple ID

Add a payment method to your Apple ID – Apple Support (UK)

If you want to change your card, you need to add first the new card, then remove the old card.

or if you use your Apple Account balance, you need to set your Apple Account balance as your default payment.

See also -> Payment methods you can use with your Apple ID

Payment methods you can use with your Apple ID – Apple Support (UK)

fyi: Not all credit & debit cards seem to work with App Store / iTunes Store, try a different one, or preferably a credit card. If your card is not accepted as a paymenf method, you need to contact your bank.

If you update your payment method or add funds to your Apple Account balance, It would take about 1 to 3 business days in order to process.

If you're still unable to update your payment method, Contact Apple Support.

If you have followed all the steps and instructions and if you still need help, get support from Apple directly -> Get Support or call Apple in your region see -> Contact Apple for support and service or check -> here for more support and assistance.