"UR: Checkout Rules｜Validation" lets you control who can place an order and what can be purchased. Create rules that combine conditions such as cart total, quantity, weight, products, tags, shipping country, postal code, customer tags, order count, B2B, market, currency, and time of day. Orders that match a rule are blocked in the cart and at checkout—including Shop Pay and other express checkouts—with your own message. Useful for order limits, regional restrictions, and unwanted orders.

• Block orders in cart and checkout, including Shop Pay and express checkouts.
• Combine 45 conditions: amount, quantity, products, customers, address, time.
• Use allow or block lists for countries, products, tags, postal codes, and more.
• Show a custom block message for each rule so customers know why.
• Enable, disable, or duplicate rules anytime from the rule list.