By 'gift card' do you mean eVoucher? If so, the T&Cs are here:
eVoucher terms and conditions
The relevant section in bold by me:
Quote:
2. Any balance remaining on the eVoucher may be applied to future purchases. Where goods purchased with the eVoucher are subsequently refunded, monies owing will be paid in the form of a new eVoucher.
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Yes, the card can be used with discount codes because the card = cash.