- Introduces Checkout And Accounts Configuration API (v2026-04) for unified branding across checkout, customer accounts, and sign‑in, exclusive to Shopify Plus.
- Consolidates and deprecates the Checkout Profile and Checkout Branding APIs, adding shared design tokens, surface‑specific overrides, direct HEX color settings, and a 20‑color palette.
- Enables market‑specific branding and consistent styling across all shopper‑facing surfaces.