[Checkout Branding API] Divider style and visibility customizations

As of version 2024-07 of the Admin API, you can use the checkoutBrandingUpsert mutation to configure styling and visibility of dividers.

With this change, the dividers below the header, above the footer, between the main and order summary columns, and between sections in the main column can now be customized with visibility, style and width controls.

You can learn more about these customizable dividers in the GraphQL Admin API docs: Global divider style, Footer divided property, Header divided property, Order Summary divider property, Main divider property, and Content divider property