Online purchases are being declined

What is the exact error message?

Do you see a "Your purchase could not be completed" message? Use the article https://support.apple.com/HT201266 to review your payment methods such as credit or debit cards. Problem methods will usually have a notice in red lettering below them.

The article: https://support.apple.com/HT203005 has some information about declined payment methods.

Thank you for sharing your concerns, Kingfuture. 😉

You will need to Contact Apple Support for payment assistance.

Good luck! 👋🏼😉

Smiliñ 😎 Brian