Removing of iPad Air
I seem to have a problem with my iPad air, it's not letting me remove/delete my billing information off of my iPad.
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I presume you refer to a payment method (i.e., a credit card)? Your AppleID account requires you to have at least one registered payment method with which to purchase Apps, downloads or subscriptions.
If you need to change your registered card details - and only one credit card is registered on your account - it is necessary to add the new card before you can delete the old.
If you have a different problem, you’ll need to provide a much more detailed description of your issue.