My credit card for ITunes and Apple App is not working.
Why I cannot use Apple App or ITunes
iPhone 6s, iOS 10
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If your credit card or debit card is not being accepted in iTunes, take a look at this for some help.
If your payment method is declined in the App Store or iTunes Store - Apple Support
If you see a message that your account has been disabled in iTunes or the App Store, see this. You will need help from Apple to fix this.