Rulestage runs minimum and maximum quantity, order value, per-customer limit, capacity and signed-in-customer rules inside Shopify's checkout validation. Before you publish, run any cart, buyer and country through the simulator and see which rule wins. Contradictory rules block publishing. Every publish is a version you can roll back. Saved scenarios show what a change would do. When a shopper reports a block, load that cart against the version that was live and read the reason.
"Notify & limit orders; manage waitlists, restocks, and...
Validate and block checkout based on 30+ conditions
Advanced methods for applying min & max limits to quantities...
Super simple app to set up checkout validation rules