How can we tell what your gonna do with the card when you buy it? The simple answer is we cannot! Which is the issue, it is impossible to know!
Yup I get that, I meant more for how are you limiting it i.e. "The deal SKU is 1pc per customers and limited to UK only customers."
Is that tied to their forum account or their shop account? As if it is just the shop account, then they could just create multiple shop accounts to get around this where as if tied to the forum account, it would be much harder to get around.
Unless you could have it so that shop accounts with less than a certain spend are excluded from using the voucher code?