Install the Decionis plugin from WordPress.org and every order is checked against your margin floor before it completes — Block checkout and classic, using WooCommerce's own cost-of-goods data. Shadow mode first; you turn enforcement on when the numbers convince you.
Stacked or stale coupons that push an order below your floor are caught at checkout, not in next month's report.
Pricing and discount plugins deploy straight to your storefront. The gate evaluates what they actually produce, order by order.
When a product's cost is missing in WooCommerce, the order is flagged for cost entry rather than passed on a guess.
Margin clears your floor — checkout completes untouched.
The order breaks your floor — stopped before it completes.
Cost data is missing — flagged for a person instead of guessed.
Start in read-only Shadow Mode: see what would have been held on your real traffic before anything is enforced. How Shadow Mode works