Helpers

Optional convenience endpoints that simplify common operations. Partners can implement their own logic instead of using these helpers.

📄️ Add item to cart

**Stateless cart helper** - Adds an item to a cart and returns the updated cart with recalculated totals.

📄️ Remove item from cart

**Stateless cart helper** - Removes an item from a cart and returns the updated cart with recalculated totals.

📄️ Update item quantity

**Stateless cart helper** - Updates the quantity of an item in the cart and returns the updated cart with recalculated totals.