That's the key right there. When you go to the store to make a purchase, what do you get? A paper receipt that tells you what you purchased, how much money you spent, and the amount of sales tax you paid. In other words, a record of your purchase.
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We need to have a HUMAN READABLE receipt.
Barcodes/QRcodes can be hacked.
Absolutely NO Barcodes/QRcodes