Storefront API is now available to non-channel apps
API
Effective May 25, 2023
Apps no longer need to be a channel in order to access the Storefront APIs. Just request the appropriate unauthenticated access scope(s) to your app.
Take advantage of the Storefront API’s powerful contextualization features to build rich customer-facing experiences for your merchants.
Learn more about authenticating with the Storefront API on Shopify.dev