Checkout UI Extensions - New APIs for Summer Editions
API

Effective July 26, 2023

Shipping address write API - Extensions can use the applyShippingAddressChange API to modify address values on behalf of a buyer.
B2B context APIs - Extensions can now read details about a purchasingCompany as well as checkout settings that apply to the current buyer
Support for new metafield types - Extensions can now read metafields on carts, companies, or companyLocations. They can also write to cart metafields