Building Server Backends with Ktor
summary
Builds a working in‑app purchase verification backend using Ktor and coroutines, connecting to the Google Play Developer API and an in‑memory or App Engine datastore. Implements one POST /verify route that receives typed JSON (Moshi), looks up or fetches a subscription, caches results for 24 hours, returns subscription JSON or 404, and exposes an admin UI rendered with FreeMarker plus basic auth and form handlers. All demos run successfully via curl and browser.
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