Minimum Order Value Enforcement

Minimum order value enforcement is the order-limits discipline applied with a margin lens. The mechanics are familiar to most merchants: a minimum order value (MOV) requires the cart to reach a dollar threshold before checkout is allowed, a max-quantity rule caps how many units of a SKU a single order may contain, and a per-customer cap limits how many units or orders one customer may place over a window. What separates enforcement-grade order limits from a storefront cart message is where and how they are imposed. A cart-page banner asking the customer to 'add $15 more to check out' is a suggestion the customer can route around; true enforcement happens server-side in the cart and checkout validation function, which returns a validation error and blocks progression when a limit is violated, so the constraint holds regardless of theme code, app conflicts, or a determined buyer. The margin angle is what makes these limits worth tying to a profit system rather than configuring as static numbers. Order limits exist largely to protect economics that break at the edges. A MOV is most defensible when it is set to the cart value at which shipping subsidy and payment-processing fixed costs stop consuming the entire margin — below that point, small orders ship at a structural loss no matter what is in them. Max-quantity caps protect against single orders that would exhaust thin per-unit margin at scale, or that signal resale and promo abuse on deeply discounted SKUs. Per-customer caps protect new-customer-discount economics by stopping one buyer from harvesting a loss-leading offer across many orders. When these thresholds are derived from the same live COGS, freight, and discount data that drives the margin floor — rather than picked as round numbers like '$50 minimum' — they stop being arbitrary friction and become a coherent extension of profit governance. Connection to adjacent concepts: minimum order value enforcement is implemented on the cart and checkout validation function, the same surface that backs every hard block; it is one concrete category of checkout enforcement alongside margin-floor and discount-stacking controls; and the thresholds themselves are most naturally authored and versioned in a policy engine, so finance owns the limits declaratively rather than burying them in checkout code.