Cash app is a brilliant payment app. Sometimes transaction fails on it. The only chance to get the failed amount refunded if deducted from your account is by requesting it. Here are the steps on How to request refund on cash app:-
1. Firstly open the cash app.
2. Press the clock button on right.
3. Now click on the transaction you want refund.
4. Press the 3 dots icon on right.
5. Now select the refund option and confirm by tapping OK.