My iphon11 is not accepting my card for subscription

Hey Assasboy,

Thanks for using Apple Support Communities. If we understand correctly, you are trying to update your payment method and are experiencing issues. Does it seem that your payment is being declined? If so, start with this guidance in the related article, If your payment method is declined in the App Store or iTunes Store - Apple Support.

"How to complete your purchase if a payment failed or was declined

1. On your iPhone or iPad, open the Settings app.
2. Tap your name.
3. Tap Payment & Shipping.
4. Add a different payment method and remove the old one. 
5. Try to complete your purchase."

If you're trying those steps and cannot make the change, perhaps there is an issue with a previous order. Try using a new card or gift card to update the order as mentioned in If a message says 'billing problem with previous purchase' or 'verification required' - Apple Support.

All the best.