Update to IAP 5 | An intro to in-app purchases in Unity

The video outlines the migration process from Unity IAP v4 to v5, emphasizing significant architectural shifts that improve error handling and flexibility. The presenter provides a detailed side-by-side comparison of code implementations between versions, highlighting the transition from implementing the IStoreListener interface to using a concrete StoreController class with event subscriptions. Key segments cover essential steps: setting up store connections, fetching product definitions either manually or via a catalog, and implementing a robust purchase flow that includes error handling and transaction validation. Specific attention is paid to the importance of managing transaction IDs to prevent duplicate grants and handling deferred purchases—such as those requiring parental approval—to ensure a reliable user experience across different platforms. The tutorial also touches upon the integration of external payment providers and the setup of receipt validators required for store compliance.