How can I display Rich Media (In-App) messages only after a user logs in?

You can control the display of Rich Media using two methods:

Event-Based Triggering: Set the Rich Media to display upon a specific event (e.g., login_success) sent from the app, rather than on app launch.
SDK Delegate Control: Implement the presentation delegate in your app code to intercept the display request.
- iOS: Implement PWRichMediaPresentingDelegate and use the richMediaManager(_:shouldPresentRichMedia:) method (Objective-C: richMediaManager:shouldPresentRichMedia:). Assign your object to PWRichMediaManager.sharedManager.delegate.
- Android: Implement RichMediaPresentingDelegate and use the shouldPresent(richMedia) method. Assign it via RichMediaController.setDelegate().

Return false in these methods if the user is not logged in, then call present() on the Rich Media yourself once authentication is complete.