To change country in apple store
where Can I spend $0.42 balance in my credit
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Here are two ways you can remove all your Apple ID balance:
Spend it:
If your store credit is less than the cost of a single item on the iTunes Store, App Store, or iBooks Store, you can add a payment method such as a credit or debit card to your account [ how to add a card --> https://support.apple.com/HT201266 ]. When you buy an item, you will use the remaining store credit and the rest will be charged to your card. This payment method has to be from your old country.
Have Apple keep it
"If you still can't change your country or region, or you have less store credit than the cost of a single item, contact Apple Support." Apple will remove the balance and keep it.
Click here --> https://support.apple.com/choose-country-region Select your country, then a product such as billing. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.
Or call Apple Support --> https://support.apple.com/HT201232
References:
Click on this link to read full information about requirements for changing store country:
Change your Apple ID country or region --> https://support.apple.com/HT204447