To enable this feature, go to Extensions -> Wallet and click on Activate.
By enabling this feature, your users can deposit their unpaid referrals in their wallet. They can select a service and an amount to deposit, then they will receive a coupon for that service for that amount, which they can use to purchase items etc.
After activating the option, we must navigate to Showcases -> Account Page and activate the wallet tab.
Only verified, but unpaid referrals can be used.