Question on token testing in development: Hello, I'm developing a React Native application using StoreKit External Purchase. I'm having difficulties testing the transaction token retrieval in the development environment. Specific questions: Is it possible to test the transaction token retrieval in development/sandbox environment? Is there a special testing mode for developers that would allow simulating token reception without going through the App Store? Are there specific debugging tools to verify proper token reception? Question on native implementation: Regarding the native implementation of StoreKit External Purchase: Is there detailed documentation on creating native modules for React Native that implement StoreKit External Purchase? Can you confirm if the following approach is correct for native implementation: Using NSClassFromString(@"ExternalPurchase") Calling presentNoticeSheetWithURL:completion: Retrieving the token in the completion block Are there any code examples for complete native implementation? Question on implementation validation: For validating StoreKit External Purchase implementation: How can we verify that our implementation is correct before App Store submission? Are there validation tools or automated tests to check compliance? What are common errors to avoid during implementation? Question on best practices: Regarding implementation best practices: What's the best way to handle potential errors during token retrieval? How to handle cases where the user cancels the transaction? What are the recommended security checks for server-side token validation? Question on documentation: I'm looking for additional resources on StoreKit External Purchase: Is there specific documentation for integration with frameworks like React Native? Are there complete code examples for native implementation? Where can I find information about testing and debugging best practices? Additional technical question: Technical implementation details: What's the correct way to handle the ExternalPurchase class initialization in React Native native modules? Are there specific requirements for the URL passed to presentNoticeSheetWithURL? How should we handle the token in the completion block to ensure it's properly passed back to React Native? Question on testing workflow: Testing workflow questions: What's the recommended testing workflow for External Purchase implementation? How can we verify the token format and validity before production deployment? Are there any tools or methods to simulate the complete purchase flow in development?