prov:value
| - The method 2400 also includes a step 2420 during which an amount of change due in the transaction is calculated, either by a controller, point-of-sale terminal, user device, etc. [0166] At step 2430, a determination is made, by a controller, point-of-sale terminal, user device, or other device, of a pool which includes one or more supplemental products to offer for sale to the user.
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