Need to clear my account credit balance

If you have less store credit than the cost of a single item, contact Apple Support, they will help you clear your balance.

See also -> Check your Apple ID balance

Check your Apple ID balance – Apple Support (UK)

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 If you have an Apple Account balance that you can't use

You can't redeem or return Apple Gift Cards, App Store & iTunes Gift Cards or unused Apple Account balance for cash, except as required by law. If your jurisdiction allows the refund of redeemed gift balances, you can contact Apple Support to request a refund. When you contact Apple, include the following information:

• Your Apple ID.
• The refund amount.
• Your current delivery address.