Flutter App Deployment Setup (iOS + Android App Store)

Job Description:
We have a complete, production-ready Flutter app (74 files, fully coded, zero errors) that needs configuration and App Store submission. All code is done — this is purely setup and deployment work.
Tech stack: Flutter 3, Supabase, Firebase, Paystack, GoRouter
What we need:

Fill in Facebook App ID in AndroidManifest.xml / Info.plist (we provide the ID)
Generate Android release keystore and create key.properties
Add 6 secrets to Supabase Edge Functions dashboard (we provide all API keys)
Configure Supabase Auth redirect URLs (we provide the URLs)
Upload APNs .p8 key to Firebase Console (we provide the key)
Create Apple Services ID for Sign In with Apple
Change aps-environment to production in Runner.entitlements
Build + upload iOS IPA to App Store Connect (we have Apple Developer account)
Build signed Android AAB + upload to Play Console (we have Play Console account)
Complete content rating and data safety forms
Upload screenshots to both stores (we provide the screenshots)

Deliverables:

App live on TestFlight (iOS) and Play Console internal testing (Android)
Both store listings ready for review submission
key.properties and keystore file backed up securely

Requirements:

Flutter deployment experience (3+ apps shipped to both stores)
Familiarity with Supabase and Firebase Console
macOS machine (required for iOS build)

NOT required: Any coding, bug fixing, or feature development. The app is complete