Buying a app
Why can’t my debit card work when there’s plenty of money on it
iPhone 8, iOS 14
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Hi Ronaldkinnisono,
Welcome to the Apple Community, where some of us do our best to help each other.
Your Apple ID is used for Apple services like the App Store, Apple Music, iCloud, iMessage, FaceTime, and more.
You may want to first check that it is a card that Apple accepts.
This Apple support article (below) has the details for your country:
Payment methods that you can use with your Apple ID
https://support.apple.com/en-au/HT202631
Then
Here is how to add your card details, so you can buy the app.
Change, Add or Remove Apple ID Payment methods
https://support.apple.com/en-us/HT201266
Hope this helps you :)