Ziva helps you control how many units customers can buy using MOQ, min/max, and step quantity rules. Apply limits by product, variant, collection, or cart, and target by customer tags, login status, email, or market. Use Shopify checkout validation to block fraud, bulk orders, and repeat repurchase attempts. Add low-stock counters and customizable messages, auto-translate by store language, schedule rules, and set lifetime/re-purchase limits per customer.