Among other things, a computer-implemented method includes: identifying terms of a promotion associated with a vehicle model; determining a vehicle identification number associated with the identified terms of the promotion, the determination based on: 1) a relationship between the vehicle model and the vehicle identification number, and 2) a transaction that identifies the vehicle identification number as associated with a purchase tool; and in response to a request to activate the purchase tool, linking the purchase tool to the terms of the promotion.
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