StockLock enforces purchase limits at checkout, express checkouts included. Set a maximum, minimum or pack size per product, cap the total from a collection, and limit how many each customer can buy across their orders. Make products members-only by customer tag, block customers from ordering, and exempt tags such as wholesale. Run invite-only drops: choose who is eligible by spend, orders, tags or past purchases, then open to everyone on a schedule. Limits show on your product pages and cart.

• Max, min and pack-size limits per product, enforced at checkout
• Per-customer limits that count across orders, not just one cart
• Collection limits that cap how many items one order can take
• Invite-only drops for customers chosen by spend, orders or tags
• Members-only products and blocked customers, with your own message