Or get hold of a random barcode for someone elses' card, use that for discounts and give them the points whilst also messing up any possible data mining. There should be somewhere that allows you to upload your bardcode for your rewards cards to allow people to do this (where the code can't be used to claim stuff obviously)
Might register - www. scanmy code.co.uk
EDIT: broken the link as it has become registered since I posted
Might register - www. scanmy code.co.uk
EDIT: broken the link as it has become registered since I posted
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