# Special Features

**Namespace Support:** Many basket operations support namespace parameter to separate baskets for different purposes (e.g., "main", "wishlist", "saved"). The namespace is stored in the user's session.

**Automatic Stock Validation:** The system automatically removes unavailable products from baskets and returns them in the `unavailable_basket_products` field.

**Offer Application:** After each basket modification, the system automatically calculates and applies eligible promotional offers, returning updated pricing and discount information.