How to remove Apple ID payment method?

If this is about removing a card from Apple Wallet, see:

Change or remove the payment cards that you use with Apple Pay - Apple Support

If you would like to remove your debit card from your apple account /iTunes then most likely it will stop u if u have any active subscriptions so you will have to replace it with another payment method :e:g a debit card you don’t use often (cash app or PayPal account) or you will need to purchase an iTunes Store card and replace ur debit card with the iTunes card but you will need to replace the payment method

or if u speaking about removing it from ur wallet then you just go to the wallet app and remove payment method

If you need to change or update your Apple ID payment method

1. Open the Settings app.
2. Tap your name.
3. Tap Payment & Delivery. ... 
4. Tap Add Payment Method, enter the new payment method, then tap Done.
5. Tap Edit.
6. Tap the red delete button next to the old payment method, then tap Delete.

Remove a payment method from your Apple ID - Apple Support