Like that how to claim rma if no receipt? If the free cards don't have warranty?
Technically speaking, you are gonna be buying from Rewardslink, by utilising a voucher for the 40% deal.
It works the same as you use NTUC vouchers or so. If you buy $20 worth of stuff and use $10 voucher, u still need pay $10 and they will issue u receipt, right? Just that, the receipt will state rewardslink as the retailer or maybe other shop name. But, whatever it is, it is still valid.
Then that will be the receipt for warranty claim. 
