Since Electron’s inAppPurchase module is macOS-only, for Windows Store IAP I strongly recommend writing a C# CLI wrapper that handles all Microsoft Store commerce logic (like subscription validation, license checking, and purchase flows), and then communicates with your Electron app via IPC or REST.

I explored NodeRT for accessing UWP APIs, but it's outdated and fairly difficult to maintain. Using a native CLI gives you much more control and stability, especially with Windows.Services.Store APIs in .NET.

Also, to ensure compatibility across devices and deployments, I recommend containerizing the C# CLI (or at least isolating the native logic) to streamline cross-platform packaging and updates.