At first, i doesn't know how this works. It sure does not work automatically. Initially, i bought Milk with the same tag at the shelf showing to save 30 cents. I just buy the product at full price and realised that it does not work off the discount. So i went for a second visit. This time, i took this same picture and show it to the cashier. She noted it and scan from her book of bar code and i now see that the item had deducted 15 cents off. Aiya want give discount, don't do until so troublesome leh.
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