Billing

There have been issues with PayPal payments for content from Apple in the past. In most cases, verifying the Paypal account solved the issue. Maybe you should contact Apple Support about that directly about that, only they can look into your personal settings, to find the reason for that.

Contact Billing Support Apple

Are you sure, that this mail has been sent by Apple?

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

Did you check, of your payment details are still correct and complete?

Change, add, or remove Apple ID payment methods - Apple Support

You're welcome 🙂

Good Luck!