I already have a working Flutter application built in VS Code with Google Gemini. It launches just fine with `flutter run`, but now I want to layer in three Supabase capabilities—user authentication, database management, and real-time updates—and then wire the app to my existing PhonePe Business payment gateway. My PhonePe account and API keys are ready; I simply need to connect the dots inside the Flutter codebase. Rather than an off-the-shelf tutorial, I’m looking for live, screens-on guidance. We’ll hop on Google Meet, share screens, and move through each step together: 1. Configure and initialize the Supabase Flutter SDK. 2. Set up tables, policies, and row-level security for the authentication flow. 3. Add real-time listeners so UI widgets react instantly to data changes. 4. Integrate the PhonePe Business APIs—signature generation, callback handling, and in-app payment flow—within my existing Dart files. 5. Test everything end-to-end on both Android and iOS emulators (or real devices if needed). I’ll drive the editor; you guide, explain best practices, and supply any sample snippets or troubleshooting tips I might need. By the end of the session I want to: • Sign up / log in with Supabase from the app. • Read and write data in real time. • Complete a test transaction through PhonePe and receive a verified response. If we need a follow-up call for polishing or deployment, I’m open to scheduling additional time.