Can't find a lot of detail on this deal, but says you just pay $10 and get a $20 voucher credited to your account.
So my guess is it can be used on sale items etc.
Also no expiry date I can see, just "limited stock"
Onceit Pay $10 get a $20 Voucher
80
Referral Links
Referral: random (54)
$20 credit for the referrer when referee makes a $60+ purchase.
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Appears to be sold out ; "sorry, all alocated"
Have received my voucher now. Expires in 2 years. Can use on anything including sales.