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## API Updates for March 28, 2024

**API**

* Added an [End-to-end Guide for Headless checkout flow with the GraphQL Storefront API](/developer/docs/storefront/headless/end-to-end-guides/graphql-storefront) to describe how to work with shopper interactions on headless storefronts.

* The [Management Checkout API](/developer/api-reference/rest/admin/management/checkouts) now supports item-level and cart-level discounts.

* Updated the number of allowed domains for CORS to 2 for the [GraphQL Storefront Tokens Create a Token](/developer/api-reference/rest/admin/authentication-apis/storefront-api-tokens/create-token) endpoint.

**Bug Fixes**

* Revisited out-of-date screenshots in the [Publishing an App](/developer/docs/integrations/apps/guide/publishing-apps) article to provide the correct steps to certify an application.

* Made `state_or_province` required in the [Add Consignment to Checkout](/developer/api-reference/rest/admin/management/checkouts/consignments/add-checkout-consignment) and [Create a Customer Address](/developer/api-reference/rest/admin/management/customers/v3/addresses/create-customers-addresses) endpoints.