The customer app (Coupon Check) and the store app (Coupon Shop) interact and can be used instead of paper coupons. The store displays the QR code corresponding to the number of coupons on the screen, and the customer app reads the QR code to earn coupons. When more than 10 coupons are collected, the customer displays the QR code on the screen, reads the QR code in the store app, and processes payment.
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