# Reference

- [Cart](/readme/headless/reference/cart.md)
- [Cart / Order Line Items](/readme/headless/reference/cart-order-line-items.md)
- [Shipment](/readme/headless/reference/shipment.md)
- [Billing](/readme/headless/reference/billing.md)
- [Promotion Codes](/readme/headless/reference/promotion-codes.md)
- [Price Groups](/readme/headless/reference/price-groups.md)
- [Payment Methods](/readme/headless/reference/payment-methods.md)
- [Countries](/readme/headless/reference/countries.md)
- [Shipping Methods](/readme/headless/reference/shipping-methods.md)
- [Catalogs](/readme/headless/reference/catalogs.md)
- [Cart Custom Properties](/readme/headless/reference/cart-custom-properties.md)
- [Line Item Custom Properties](/readme/headless/reference/line-item-custom-properties.md)
- [Orders](/readme/headless/reference/orders.md)
- [Views for Cart modifying operations](/readme/headless/reference/views-for-cart-modifying-operations.md)