Do I need to use my Reward Wallet balance at all once, and does my balance expire?

You can use any amount from your Reward Wallet, whenever you like! You can choose to use your amount in one go, or over time. Funds in your Reward Wallet don't expire.  Each retailer sets their own terms for the gift cards though, with an expiry date, so you may want to check these terms before choosing a gift card.
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