Thanks for using the Apple Support Communities. If you are having issues with the billing information on your iTunes/Apple ID account, you may find the information and troubleshooting steps outlined in the following article helpful:
If your payment method is declined, or you have a billing issue with a previous purchase in the iTunes Store - Apple Support
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Did you see the link provided by jeremy_v? Reproduced below:
Question: please i have a problem with registering my card on itunes. it always shows biling error what can i do?