How can I clear balance on my Apple ID

Before you change your Apple ID region: Spend any balance remaining on your Apple ID, you can make a purchase for more than your balance and the difference will be billed to you. You can also contact Official Apple Support and they can zero the balance for you.

Change your Apple ID country or region ⇢ Change your Apple ID country or region - Apple Support

Hello ~If you are trying to zero your balance before changing regions…you may purchase an item from the App Store for more than your balance and the remainder will be billed to your credit card on file thus zeroing your balance . You may also go to lower left hand corner and click on Support and they can zero it for you or…

Contact Apple for support and service

Also if you are changing regions take a look through this article as well…

Change your Apple ID country or region - Apple Support

~Katana-San~