Proof of purchase
From Wikipedia, the free encyclopedia
A proof of purchase is typically some portion of the package of consumer goods, and is defined by the product's manufacturer. Most commonly, the proof of purchase is defined as the UPC symbol on the package, but can be some other portion of the package (such as a boxtop).
The proof of purchase is often required for sales promotions and manufacturer rebates as evidence that the customer purchased the product. When multiple purchases are required to redeem these rewards, it is referred to as a premium incentive.
