My billing-software app is already live on Google Play with an in-app subscription that removes ads. I now want to open it up for everyone by letting non-subscribed users run the app for free while seeing Google AdMob interstitial ads. Here’s the flow I need implemented: • Detect the user’s subscription status using the existing Play Billing setup. • If the subscription is active, continue the current ad-free experience. • If the subscription is inactive or absent, load and display AdMob interstitials at regular intervals that feel natural for a billing workflow (we can fine-tune the exact timing together). • Make sure failed ad loads or lack of internet never block core features. • Follow all Google Play and AdMob policy requirements, including consent where necessary. • Supply a release-ready Android Studio project (AAB + source) and clear setup notes so I can push the update seamlessly. The codebase is in Android Studio (Java/Kotlin mix). If this sounds straightforward to you and you have prior experience integrating AdMob interstitials alongside Google Play Billing, let’s get the update wrapped up quickly.