How do I fix my payment method on my Apple ID?
“To avoid interruptions to your subscriptions and purchases, verify your payment information or add a new payment method.”
How can I fix this?
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Did you already check if the payment information is still complete and correct?
Have a look at this article:
If you need to change or update your Apple ID payment method - Apple Support
In the meantime you can also redeem Apple Gift Cards to pay for Apple Services and more:
What you can buy with your Apple Gift Card or Apple Account balance - Apple Support