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See If your payment method is declined in the App Store or iTunes Store https://support.apple.com/en-us/HT203005

Note that before you can add funds to your Apple ID, you must have a valid payment method on file. Learn about the payment methods that you can use with your Apple ID. ... See how to Add funds to your Apple ID https://support.apple.com/en-us/HT208687  Note that "after you authorize the payment, the funds ... [are credited] to your Apple ID. Then, you can use the credit to make purchases from the App Store or iTunes store. Need more help? Contact Apple support for help here: Get started

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If necessary, contact iTunes Support. See the Apple Support article below for contact information.   

iTunes Support – world wide        

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