How do I clear my Apple Account balance?

If you are unable to spend the balance, you can contact Apple directly and they will be able to clear it for you:

Contact Apple for support and service - Apple Support

Otherwise any purchase you make will first come from your Apple Account, with any remainder being charged to your payment method if you have one.

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…

Apple Support

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

***Contact Apple for support and service - Apple Support

~Katana-San~