Use when installing a Spree gem (spree_stripe, spree_easypost, spree_meilisearch, spree_opentelemetry, spree_i18n, spree_adyen, spree_multi_store…) or building your own reusable Spree 6 extension — a gem (Rails engine) for models, API endpoints, permissions, hooks and providers, paired with a dashboard plugin (npm package) for admin screens.
