> For the complete documentation index, see [llms.txt](https://dev.ucommerce.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev.ucommerce.net/readme/headless/reference.md).

# Reference

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