I am building a Point of sales (POS) app. You purchase items by touching your phone to them. Think Apple Pay. The user touches an item in the store and they just purchased it. They can leave with the item but the screen says if purchase this other thing they will get 5% off both. They purchase the second the the screen says get this third and get 7% all three ... and so on .... 4th (9%), 5th (11%) etc ...

The big idea is the purchase is the start of the shopping experience not the end ...

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