Teach Android App Subscription Code Integration

I want to learn, hands-on, how to add a Google Play in-app subscription to an Android Studio project. I’m comfortable with Java and Kotlin but I’ve never used the Play Billing Library, so I need you to walk me through the complete flow: configuring products in the Play Console, wiring the BillingClient in code, handling purchases, acknowledging them, and making sure the UI reacts properly when a user upgrades, downgrades, or cancels. We can work in a fresh demo project or inside my existing one—whatever you feel showcases best practices. I’ll share my screen during a live session and record it for later reference. By the end I expect to have a clean, commented code sample I can reuse, plus clarity on testing with sandbox accounts and pushing the build to internal track for review. Please estimate how long the session will take, suggest any preparation I should do in advance, and let me know if you prefer Zoom, Meet, or another tool for the walkthrough.

Project ID: 40420345