Debit card

If you want to edit your payment methods:

1. Go to Settings > [your name] > iTunes & App Store.*
2. Tap your Apple ID, then tap View Apple ID. You might be asked to sign in.
3. Tap Manage Payments. (If you're using an older version of iOS, tap Payment Information.) Then add, update, reorder, or remove your payment methods:

(https://support.apple.com/en-us/HT201266)

Best regards!

Apple ID without a credit card  

Apple ID - If you can‘t choose None when you edit your Apple ID payment information

You don't have to put another one instead

Does it allow you to do so?