Integrate with RevenueCat

Please integrate RevenueCat into our app by adding the RevenueCat SDK and configuring it with our App Store/Google Play products.
Also wire the purchase/subscription lifecycle events (e.g., customer info updates and entitlement/subscription changes) so we can track conversions and revenue attribution end-to-end.
Make sure subscription status changes are reflected immediately in-app via RevenueCat entitlements.