Define the calculation base
State whether qualification uses merchandise subtotal or another clearly defined amount and how discounts, taxes, shipping, duties, gift cards, and excluded items are treated. Align the published example with the implemented calculation.
Check the economics around the threshold
Evaluate likely basket movement, product margin, fulfillment cost, incentive cost, and return behavior near the cutoff. A higher order total does not automatically mean higher contribution.
Plan for changed orders
Define how edits, partial cancellations, and returns affect the qualifying amount. Give support teams a reason code and a customer-ready explanation for each outcome.