Flutter App Publishing Expert (Google Play + Apple App Store)

desc : I have a Flutter mobile app that’s already connected with RevenueCat for in-app subscriptions (Google Play Billing + Apple In-App Purchases).
The app is fully developed and tested, and I already have the following ready:

✅ Google Play Developer Account (90% configuration completed — needs final publishing setup and testing)

✅ Apple Developer Account (requires app setup and submission)

✅ RevenueCat integration completed (working fine)

Now, I need a Flutter + App Store expert to:

Complete the final Google Play publishing configuration and testing (internal/external testing).

Prepare and submit the app to Apple App Store (TestFlight + final release).

Ensure in-app purchases/subscriptions work properly on both platforms (using RevenueCat).

Help with store listing, screenshots, and metadata if needed.