Set a minimum order quantity, a maximum, or sell in fixed packs of 6. Rules apply per product, per variant, per collection or per customer tag, and a cart-wide minimum order value is one field. As the shopper types, an invalid quantity snaps to the nearest valid one. A Cart and Checkout Validation Function applies the same rule again at checkout, so a direct cart link, a Buy now button or the Shop app cannot get around it. Works on every Shopify store, with or without Shopify Plus.

• Minimum, maximum and pack-size (step) rules per product and per variant
• Collection rules and customer-tag rules, including per-tag exemptions
• Cart-wide minimum order value, and minimum or maximum cart quantity
• Enforced again at checkout by a Cart and Checkout Validation Function
• Bulk setup by CSV, Matrixify, Flow or ERP: rules live in metafields