some of our features, like Functions, are not working with Shops that do still use checkout.liquid customizations. Is there a way to determine using the Admin API, if a shop still uses customizes checkout.liquid or already upgraded to Checkout Extensibility?
We found some useful feature flags, but not the one we were looking for.
yeah, we tried this as well, though it does not reliably tell if a merchant has really upgraded yet. Would be cool to have some feature flag that lets developers know if functions can be applied or not.