Why a discount exists at all
Someone holds a £100 card for a shop they never use. £85 in cash is better than £100 they will not spend. A platform matches them with a buyer and takes a cut.
That is the honest version, and it accounts for a lot of the market. Typical genuine discounts are modest — a few percent to around fifteen. Anything far beyond that is coming from somewhere else.
The failure mode
A code can be sold and then drained by the seller. They know the number. Nothing stops them spending it after you pay, and you find out at the checkout.
This is the risk that makes the market different from ordinary resale. Everything else follows from it.
What reduces the risk
- Buy through a platform with a balance guarantee, not from an individual directly. The guarantee is what you are paying the platform for.
- Check the guarantee window. Some cover 24 hours, some 12 months. A short window is a weak guarantee.
- Redeem immediately. The moment it arrives, put it on your account. An unredeemed bought code is a race you might lose.
- Check the balance before spending, and screenshot it.
- Pay by a disputable method.
What should stop you
- Discounts far beyond the normal range on brands everyone wants.
- A seller who will only take irreversible payment.
- No guarantee, or a guarantee measured in hours.
- Photographs of physical cards with the PIN panel already scratched.
Physical cards secondhand
Higher risk than digital. The PIN panel can be scratched, photographed and resealed convincingly. Unless you can verify the balance at the till before paying, treat these as unsafe.
Is it worth it?
An honest answer: for a modest discount on a brand you were going to spend at anyway, bought through a platform with a real guarantee, redeemed immediately — the risk is small and the saving is real.
For a large discount from an individual with no guarantee, you are buying a lottery ticket at a price that assumes you will win.
If a card you bought turns out to be empty
Claim on the platform's guarantee the same day — that is what the short windows are designed to enforce. Keep the listing, the payment record and a screenshot of the zero balance. Then read what to do if a gift code was stolen, which applies here too.