Re: My Capital One Card is not working with Apple Store
Your Apple (ID) Account is the one account you use for purchases ... whether iTunes, App Store, iCloud etc.
You may need to check you are signed in with the correct Apple Account info:
Sign in to your Apple Account - Apple Support
You can see which payment methods Apple can accept in your country or region:
Payment methods that you can use with your Apple Account - Apple Support
If you don't have a valid payment method listed in your Apple Account for purchases from Apple:
See how to: Add a payment method to your Apple Account - Apple Support
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Re: I've used this card before and use it for every day purchases, so unsure why it suddenly won't work
If used previously for purchases from Apple : you may want to check the expiry date is still valid
or
If you have disputed a charge from Apple: check with the card provider to ensure it can be used with Apple again.
or
If making an international purchase: check it is authorized with the provider for such use.