The square with the lines and dots is called a QR code. QR stands for quick response.
If you read those ads, you'll see that those are digital "mfg" coupons. Meaning - manufacturer's coupons. They're just like the coupons that come in Sunday paper inserts. You can open your app and let the cashier scan the QR code, OR you can print out the page, OR you can just grab the paper copy at the front of the store and use those instead.
But those deals are offered by the manufacturer of the product, so no, it can't just be a discount on your account. The cashier has to scan in a code, so that the store gets credit from the manufacturer for giving that discount to you. Otherwise, the store has to eat the cost of a discount they aren't offering.
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