As of API version 2026-01, the shopAddress field will be introduced to the Shop object in the GraphQL Admin API. This new field replaces the now-deprecated billingAddress field, which will be removed in a future version. shopAddress will have identical structure and values as billingAddress.
This is a companion discussion topic for the original entry at https://shopify.dev/changelog/deprecation-of-shop-billingaddress-in-favor-of-shop-shopaddress