Set min and max purchase quantity limits per product, variant, or collection. Enforce rules at checkout using Shopify Functions — customers cannot bypass limits. Supports order value limits, cart item limits, weight-based limits, and per-customer lifetime caps. Create product groups for cross-product combined limits. Target rules by customer tags for wholesale vs retail. Schedule time-based restrictions and use quantity increments for case-pack selling. Works with drawer carts and AJAX carts