I am developing a mobile application using Flutter and plan to implement in-app subscriptions for both iOS platforms. I would like to request guidance on the following: Technical Implementation: Recommended best practices for implementing auto-renewable subscriptions in Flutter apps StoreKit 2 integration requirements and compatibility considerations Server-to-server notification setup and endpoint requirements Testing Procedures: Sandbox environment configuration and testing workflow TestFlight testing requirements for subscription features Recommended testing scenarios before production release Required Documentation and Accounts: Complete list of required agreements (Paid Applications Agreement, etc.) Banking and tax information requirements Privacy policy and terms of service specifications for subscription apps App Review guidelines specific to subscription-based apps Subscription Management: Grace period implementation requirements Handling subscription cancellations and refunds Promotional offers and introductory pricing setup Could you please provide documentation or direct me to the appropriate resources? Additionally, if there are any specific requirements for Flutter-based applications, I would appreciate that information. Application Details: Platform: iOS (Flutter framework) Subscription Type: Auto-renewable subscriptions

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