Fuente: Wipo "digitalization" A point-of-sale system automatically processes a credit towards a pre-registered upsell along with a conventional transaction. The system receives an identifier pursuant to the transaction which is used to determine the pre-registered upsell and instructions for adjusting a purchase price from the transaction to provide the upsell credit. The instructions may direct, for example, that the purchase price be rounded up, that a predetermined amount be added thereon, or that the purchase price be adjusted to equal an actual value tendered. The upsell credit, determined as the difference between the purchase price and the adjusted purchase price, may be accumulated over multiple transactions, or immediately applied to purchase the upsell.