In order to spend your wallet credit, you will need to select a Perk that produces a digital voucher with a value against it. Some of our customer's favourites include Tesco, Sainsbury's, Currys, and Primark. Here is what the icon looks like:
To summarise, any Perks displaying an icon to either 'Earn points or Save __%' are eligible for your wallet to spend. Just apply your wallet balance at the checkout: