| http://www.w3.org/ns/prov#value | - In the case where the buyer was charged for the product at the time the sale was arranged with the purchasing system, the purchasing system may credit the difference back to the buyer's account. [0179] Additionally, the purchasing system device 310 may distribute payment, such as by using an Electronic Fund Transfer (EFT) transaction, to the retailer that provided the product to the buyer (i.e., o
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