1
Give the gate a cost basis
Margin needs a denominator: unit costs, fees, and shipping land in the policy so the floor is computed from what the order actually earns, not from list price.
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Use case · Checkout margin protection
Every order clears the floor, or it waits for a decision.
How merchants put a deterministic margin floor inline at checkout: coupon stacking, price drift, and over-selling evaluated against cost basis in under 120ms, held orders escalated for a decision, and a signed record of every gate — starting in shadow mode where nothing blocks.
The recipe
Cost basis, shadow week, then enforce
2
Watch a week in shadow
The gate evaluates live checkouts without blocking any of them and reports what would have been held — stacked codes, drifted prices, negative-margin baskets — so the floor is set from your own traffic, not a guess.
3
Enforce with an escape hatch
Turn enforcement on and ambiguous orders escalate instead of failing: a person approves or rejects the held order, and every verdict — allowed, held, or refused — carries a signed dossier for the dispute that comes later.
Asked directly
What merchants ask before installing
What exactly gets stopped at the checkout?
Orders that break the rules you set: incompatible discount codes stacked into one basket, carts priced below the margin floor after every adjustment, quantities the shared inventory position cannot cover. The gate returns its verdict inline before the order commits.
The commerce surfaceHow does coupon stacking actually get caught?
The gate evaluates the whole basket's economics, not codes one at a time: whatever combination of discounts, tiers, and shipping promotions is applied, the question asked is whether the resulting order clears the floor. Stacks that survive individually and fail together are exactly what per-code rules miss.
The stacking guardrailDoes this prevent over-selling too?
Yes — the same gate validates live inventory at the moment of checkout, so multi-channel sellers stop committing units they no longer have. Marketplace seller ratings live and die on this.
Over-selling preventionWhere does it run for my platform?
Shopify merchants install the Decionis Checkout Gate from the App Store; WooCommerce stores use the plugin from WordPress.org; everything else — custom checkouts, other platforms — calls the same evaluate-decision API the apps use.
The Shopify listingHow is prevented loss counted, and can I trust the number?
Conservatively, and the method is published: prevented loss is computed from governed decisions the gate actually held, never extrapolated, and the aggregate only renders once the sample clears a threshold. The methodology page shows exactly how the figure is built.
The methodologySee a week of your own leakage first
Shadow mode reports the stacked codes, drifted prices, and negative-margin orders the gate would have held — before a single checkout is blocked.
Start in shadow mode