The cashback you earn from using your card is deposited into your Bitrefill Card Cashback balance, which you can access by going to the Rewards section of the Bitrefill Card.
Once you open the Rewards section, you will see your overall earned cashback displayed clearly in Euros and there is a button beneath which enables you to redeem your balance for Bitrefill store credit instantly.
You can then use those store credits to purchase any products in the catalogue you like, including gift cards for flights, clothing, electronics, hotels, eSIMs, prepaid phone balance and more.