Apple ID balance
How can I remove my Apple ID balance?
iPhone SE, iOS 13
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Either spend it, or contact iTunes support and ask them to remove it.
Apple advises that, if your credit balance is less than the cost of an item on the iTunes Store (including App Store), then you can add a credit card to your account. When buying an item, your remaining store credit will be used up, with the remainder of the purchase price charged to your credit card.
If you do not have a credit card, contact iTunes Store support for assistance: