Why is my account canceled?

See If your payment method is declined in the App Store or iTunes Store https://support.apple.com/en-us/HT201266

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See Change, add, or remove Apple ID payment methods https://support.apple.com/en-us/HT201266

Need more help? Contact Apple support for help here: Get started

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See the first link Eric posted.

Canceled or disabled?

If you see a message that says 'Your account has been disabled in the App Store and iTunes' - Apple Support.    

Contact iTunes Support.     

iTunes Support – world wide