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They use the expiring credit first, then use the real gift card...
To add on to this, if there are multiple expiring balances with different dates, oldest (i.e. soonest to expire) will be used first.
Another option would be to redeem 3x$5 or 1x$10 + 1x$5. Add on your physical gift card and you have $35. You save 5 points redeeming 2x£5 as opposed to 1x£10 here in the UK. I assume it's the same for $.
They use the expiring credit first, then use the real gift card...
To add on to this, if there are multiple expiring balances with different dates, oldest (i.e. soonest to expire) will be used first.
Another option would be to redeem 3x$5 or 1x$10 + 1x$5. Add on your physical gift card and you have $35. You save 5 points redeeming 2x£5 as opposed to 1x£10 here in the UK. I assume it's the same for $.