My card is being declined when I try to purchase games in Apple Store

See -> If your payment method is declined in the App Store or iTunes Store

If your payment method is declined in the App Store or iTunes Store - Apple Support

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Get more help

• If you disputed a charge from the App Store or iTunes Store, contact your financial institution again to authorize that charge and future purchases from the App Store or iTunes Store.
• If you're outside of the United States, you might need to contact your financial institution to allow international purchases.
• In some countries and regions, your payment method might be declined because of changes to local law. Learn about billing and purchases in Europe or what to do if your card is declined in India.
• If you still need help, contact Apple Support.

Don’t 10% quote me but o don’t believe you can use the card on app purchases usually things like a skin or cords also it depends if your useing a gift card or a rebate gift card from apple,, hope that helps