Start with the behaviour, not the reward
The usual design conversation begins with what to give away and how much. That is the last question, not the first. Begin instead by naming the one behaviour the scheme exists to change, and be specific enough that you could tell whether an individual outlet did it: stock at least four of our six categories, place an order in every month of the quarter, clear invoices within the agreed period, or maintain the display through the season.
One behaviour per scheme is a discipline worth defending. Multi-objective schemes look generous and read as noise. The retailer optimises for whichever line is easiest, which is almost never the one that mattered to you.