TestFlight Deployment For Flutter App

I have a production-ready Flutter application that has already passed every Android test; now I need it live on TestFlight so I can distribute it to myself and a small private group of iOS testers. Because I work on Windows and do not have access to a Mac, I build through Codemagic. To protect my source, I will not share the code base. Instead, I will provide the exact build configuration, signing-related assets that belong to me, and any log or error message that surfaces during the process. Here is the workflow I envision: • You connect your paid Apple Developer account to Codemagic and handle all certificate and provisioning profile creation needed for an App Store Connect upload. • Using only the settings I provide, you help me configure Codemagic so the iOS build succeeds and is automatically pushed to TestFlight. • Once the build lands in TestFlight, you add me and my small tester group as internal testers so we can download and run the app. Acceptance criteria – The build compiles in Codemagic without code access. – The binary appears in App Store Connect and becomes available on TestFlight. – All invited testers (myself included) receive access and can install the app. Prerequisites on your side • Active, paid Apple Developer account you control (we will not use mine). • Working paid Google Developer account, confirming you are fully set up on both major stores. • Familiarity with Flutter iOS signing, Codemagic pipelines, and App Store Connect/TestFlight workflows. If you have recently shipped Flutter apps to TestFlight using Codemagic, please mention that experience when you respond.