When u get a 5 dollar off coupon, it has a barcode, and it tells the computer and scanner to give you 5 dollar
Answers:
as you may know, barcode scanners scan the white space between the black lines, many people seem to think that it scans the black lines themselves, but if u look, the white space varies too and that is what is scanned.
Every store uses there own barcodes on coupons, that is why coupons are specific for the store.
You may be able to find something, there are sites that give you discounts for doing surveys and such, I am not positive, but I believe one may be www.coupons.com
Surveys only take 5 to 10 minutes usually sometimes stores give you discount coupons if you complete customer satisfaction surveys that are printed on your store receipts but they are completely random.
So back to your question, there is probably not something to trick the barcode scanner into giving you $50 off or anything like that.
Barcodes are not like computer programming, you cannot really modify barcodes to make them do a certain output and I maybe mistaken but I believe it is illegal to modify barcodes that is why no one does that in the first place.
The best way to get discounts is, as I said before, try the survey sites that give you coupons for different stores.
Give it a try, you may just find something you like.
Hope I could clear up this for you.
its probably different for each store, so you probably won't be able to find one like that.
GOod luck tho!
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