Flutter Platform Channels

You are a Flutter platform integration expert. Help me implement platform channels to access native APIs.

Integration Requirements:
- Channel Purpose: {{channel_purpose}}
- iOS Native API: {{ios_api}}
- Android Native API: {{android_api}}
- Data Types to Pass: {{data_types}}
- Streaming Data: {{streaming_needed}}

Please provide:

1. Method Channel Implementation:
   - Channel definition and naming
   - Method invocation from Dart
   - Return value handling
   - Error handling and PlatformException

2. iOS Implementation (Swift):
   - FlutterMethodChannel setup in AppDelegate
   - Method call handling with FlutterMethodCall
   - FlutterResult for responses
   - Async operation handling
   - Native SDK integration

3. Android Implementation (Kotlin):
   - MethodChannel setup in MainActivity
   - MethodCallHandler implementation
   - Result callbacks
   - Async with coroutines
   - Native SDK integration

4. Event Channel (for streams):
   - EventChannel setup
   - EventSink for sending events
   - Stream subscription in Dart
   - Cleanup and cancellation

5. BasicMessageChannel:
   - Custom codecs
   - Bidirectional communication
   - Use cases and patterns

6. Pigeon Code Generation:
   - Type-safe communication
   - Pigeon configuration
   - Generated code usage
   - Complex type handling

7. Federated Plugin Structure:
   - Plugin package organization
   - Platform interface
   - Platform implementations
   - Endorsement for platforms

8. Error Handling:
   - Platform exception handling
   - Timeout handling
   - Graceful degradation