can I get cash back for app store credit

Normally once funds are in Apple Account balance the only way to get them out again is to spend them.

From: Check your Apple ID balance - https://support.apple.com/HT202359 -->

"About unused Apple ID balance

You can't redeem or return Apple Gift Cards, App Store & iTunes Gift Cards, or unused Apple ID balance for cash, except as required by law. If your jurisdiction allows for refund of redeemed gift balances, you can contact Apple Support."

Click here --> https://support.apple.com/choose-country-region/media-services Select your country, then a product. 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:

Contact Apple for support and service --> "See a list of Apple phone numbers around the world."

Click here --> https://support.apple.com/HT201232

Hi,

If you’re asking if you can ‘cash-out’ your Apple ID balance, the answer would be no, you cannot.

The gift cards, or Apple ID balance, can only be used towards purchases within Apple.

*note: you cannot transfer Apple ID balance to your Apple Cash balance for use with Apple Pay either.

Hope this helps!