I'll analyze the repository to understand the new changes and provide a comprehensive summary for your Flutter SDK recreation. Let me examine the key files that have been modified or added.
Read file: EMAIL_VERIFICATION_INTEGRATION.md
Read file: API_KEY_BACKEND_INTEGRATION.md
Read file: src/components/EmailVerificationModal.tsx
Read file: src/services/platformAuthService.ts
Read file: src/components/onboarding/PinInput.tsx

Let me read more files to understand the complete scope of changes:
Read file: src/utils/programmaticFlow.ts
Read file: src/services/apiKeyService.ts
Read file: src/utils/secureStorage.ts
Read file: src/components/onboarding/OAuthWebView.tsx
Read file: src/types.ts

Let me get the YouTube setup documentation to understand the specific OAuth fixes:
Read file: YOUTUBE_SETUP.md
Read file: test-email-verification.js

Read file: src/services/platformAuthService.ts
Read file: src/services/platformAuthService.ts

Read file: src/services/platformAuthService.ts

# Summary of New Changes for Flutter SDK Recreation

Based on my analysis of the React Native SDK changes, here's a comprehensive summary of the new features and fixes you'll need to implement in your Flutter SDK:

## 1. 📧 Email Verification System with API Key Authentication

### New Email Verification Flow:
- **API Key Authentication**: All requests now require `Authorization: Bearer OnairosIsAUnicorn2025` header
- **Three-step flow**: Request → Verify → Store JWT
- **Test mode support**: Mock responses for development

### Key API Endpoints:
```http
POST /email/verification
Authorization: Bearer OnairosIsAUnicorn2025
Content-Type: application/json

{
  "email": "user@example.com",
  "action": "request"  // or "verify"
  "code": "123456"     // only for verify action
}
```

### Implementation Details:
```dart
// Request verification
Future<Map<String, dynamic>> requestEmailVerification(String email, bool testMode) async {
  if (testMode) {
    return {
      'success': true,
      'message': 'Email verification sent successfully (test mode)',
      'requestId': 'test-request-${DateTime.now().millisecondsSinceEpoch}'
    };
  }
  
  final response = await makeAuthenticatedRequest('/email/verification', {
    'method': 'POST',
    'body': jsonEncode({
      'email': email,
      'action': 'request',
    }),
  });
  
  // Store request ID for tracking
  if (response['success']) {
    await secureStorage.write(key: 'email_verification_request_id', value: response['requestId']);
    await secureStorage.write(key: 'email_verification_request_email', value: email);
  }
  
  return response;
}

// Verify code
Future<Map<String, dynamic>> verifyEmailCode(String email, String code, bool testMode) async {
  if (testMode) {
    final mockToken = 'test-jwt-token-${DateTime.now().millisecondsSinceEpoch}';
    await secureStorage.write(key: 'email_verification_token', value: mockToken);
    return {
      'success': true,
      'message': 'Email verification successful (test mode)',
      'existingUser': false,
      'jwtToken': mockToken,
    };
  }
  
  final response = await makeAuthenticatedRequest('/email/verification', {
    'method': 'POST',
    'body': jsonEncode({
      'email': email,
      'code': code,
      'action': 'verify',
    }),
  });
  
  // Store JWT token from response
  if (response['success'] && response['jwtToken'] != null) {
    await secureStorage.write(key: 'email_verification_token', value: response['jwtToken']);
    await secureStorage.write(key: 'onairos_jwt_token', value: response['jwtToken']);
    await secureStorage.write(key: 'email_verification_email', value: email);
  }
  
  return response;
}
```

## 2. 🔐 PIN Logic with Backend Storage

### PIN Creation and Storage:
- **PIN requirements**: Minimum 6 characters, numbers, special characters
- **Backend storage**: Send PIN to `/store-pin/web` endpoint after biometric verification
- **Secure storage**: Store PIN creation status locally

### Implementation:
```dart
// PIN validation
bool validatePin(String pin) {
  if (pin.length < 6) return false;
  if (!RegExp(r'\d').hasMatch(pin)) return false;  // Must contain number
  if (!RegExp(r'[!@#$%^&*(),.?":{}|<>]').hasMatch(pin)) return false;  // Must contain special char
  return true;
}

// Store PIN after biometric verification
Future<Map<String, dynamic>> storePinAfterBiometric(String username, String pin, String? jwtToken) async {
  final authToken = jwtToken ?? await getStoredJwtToken();
  
  if (authToken == null) {
    return {
      'success': false,
      'error': 'No authentication token available',
    };
  }
  
  final response = await makeAuthenticatedRequest('/store-pin/web', {
    'method': 'POST',
    'headers': {
      'Authorization': 'Bearer $authToken',
    },
    'body': jsonEncode({
      'username': username,
      'pin': pin,
    }),
  });
  
  if (response['success']) {
    await secureStorage.write(key: 'user_pin_stored', value: 'true');
    await secureStorage.write(key: 'pin_storage_timestamp', value: DateTime.now().millisecondsSinceEpoch.toString());
  }
  
  return response;
}
```

## 3. 🔑 API Key Service with Admin Key

### API Key Management:
- **Admin key**: `OnairosIsAUnicorn2025` for full permissions
- **Developer keys**: Must be 32+ characters, start with `dev_` or `pk_`
- **Automatic initialization**: Auto-initialize with admin key for testing

### Implementation:
```dart
class ApiKeyService {
  static const String ADMIN_API_KEY = 'OnairosIsAUnicorn2025';
  static bool isInitialized = false;
  
  static Future<void> initializeApiKey(Map<String, dynamic> config) async {
    if (isInitialized) return;
    
    final apiKey = config['apiKey'];
    if (apiKey == null || apiKey.length < 32) {
      throw Exception('Invalid API key format');
    }
    
    // Store configuration
    await secureStorage.write(key: 'api_key', value: apiKey);
    await secureStorage.write(key: 'api_environment', value: config['environment'] ?? 'production');
    
    isInitialized = true;
  }
  
  static Map<String, String> getAuthHeaders() {
    final apiKey = secureStorage.read(key: 'api_key') ?? ADMIN_API_KEY;
    return {
      'Authorization': 'Bearer $apiKey',
      'Content-Type': 'application/json',
      'User-Agent': 'OnairosFlutter/1.0.0',
      'X-SDK-Version': '1.0.0',
      'X-API-Key-Type': apiKey == ADMIN_API_KEY ? 'admin' : 'developer',
      'X-Timestamp': DateTime.now().toIso8601String(),
    };
  }
}
```

## 4. 🎯 YouTube-Specific OAuth Fixes

### YouTube Native SDK Integration:
- **Google Sign-In**: Use `google_sign_in` package for Flutter
- **Proper token handling**: Include refresh token for YouTube API
- **Channel info fetching**: Get YouTube channel details
- **Backend integration**: Send tokens to `/youtube/native-auth`

### Implementation:
```dart
Future<bool> initiateYouTubeAuth(String? username) async {
  try {
    // Configure Google Sign-In
    await GoogleSignIn().signIn();
    final GoogleSignInAccount? account = GoogleSignIn().currentUser;
    
    if (account == null) throw Exception('Google Sign-In cancelled');
    
    // Get authentication details
    final GoogleSignInAuthentication auth = await account.authentication;
    
    // Get YouTube channel info
    final channelResponse = await http.get(
      Uri.parse('https://www.googleapis.com/youtube/v3/channels?part=snippet&mine=true'),
      headers: {
        'Authorization': 'Bearer ${auth.accessToken}',
        'Accept': 'application/json',
      },
    );
    
    String channelName = 'Unknown Channel';
    String? channelId;
    
    if (channelResponse.statusCode == 200) {
      final channelData = jsonDecode(channelResponse.body);
      if (channelData['items']?.isNotEmpty == true) {
        channelName = channelData['items'][0]['snippet']['title'];
        channelId = channelData['items'][0]['id'];
      }
    }
    
    // Send to backend
    final backendResponse = await makeAuthenticatedRequest('/youtube/native-auth', {
      'method': 'POST',
      'body': jsonEncode({
        'session': {
          'username': username ?? account.email,
          'platform': 'youtube',
          'timestamp': DateTime.now().toIso8601String(),
          'channelName': channelName,
          'channelId': channelId,
        },
        'accessToken': auth.accessToken,
        'idToken': auth.idToken,
        'refreshToken': auth.refreshToken,  // CRITICAL: Include refresh token
        'userAccountInfo': {
          'username': username ?? account.email,
          'email': account.email,
          'channelName': channelName,
          'channelId': channelId,
        },
      }),
    });
    
    return backendResponse['success'] ?? false;
  } catch (e) {
    print('YouTube auth error: $e');
    return false;
  }
}
```

## 5. 🔄 OAuth WebView Improvements

### Enhanced OAuth Handling:
- **Better error detection**: Parse OAuth errors from URLs
- **Timeout handling**: 60-second timeout for OAuth flows
- **Gmail-specific patterns**: Handle Gmail success redirects
- **Retry mechanism**: Allow users to retry failed authentications

### Implementation:
```dart
class OAuthWebView extends StatefulWidget {
  final String url;
  final String platform;
  final Function(String) onSuccess;
  final VoidCallback onClose;
  
  @override
  _OAuthWebViewState createState() => _OAuthWebViewState();
}

class _OAuthWebViewState extends State<OAuthWebView> {
  Timer? _timeoutTimer;
  
  @override
  void initState() {
    super.initState();
    // Set 60-second timeout
    _timeoutTimer = Timer(Duration(seconds: 60), () {
      setState(() {
        // Handle timeout
      });
    });
  }
  
  bool _isOAuthComplete(String url) {
    final completionPatterns = [
      'code=',
      'onairos.uk/Home',
      'onairos.uk/home',
      'success=true',
      'access_token=',
    ];
    
    return completionPatterns.any((pattern) => url.contains(pattern));
  }
  
  bool _isOAuthError(String url) {
    final errorPatterns = [
      'error=',
      'error_description=',
      'access_denied',
      'user_cancelled',
    ];
    
    return errorPatterns.any((pattern) => url.contains(pattern));
  }
  
  @override
  Widget build(BuildContext context) {
    return WebView(
      initialUrl: widget.url,
      onPageFinished: (url) {
        if (_isOAuthComplete(url)) {
          _timeoutTimer?.cancel();
          final code = _extractCodeFromUrl(url);
          if (code != null) widget.onSuccess(code);
        } else if (_isOAuthError(url)) {
          _timeoutTimer?.cancel();
          // Handle error
        }
      },
    );
  }
  
  @override
  void dispose() {
    _timeoutTimer?.cancel();
    super.dispose();
  }
}
```

## 6. 🆕 New Account Issue on Email Verification

### Account Creation Flow:
- **Email verification determines user type**: Existing vs new user
- **New users**: Go through full onboarding (platforms → PIN → training)
- **Existing users**: Skip to data request and return API URL
- **JWT token storage**: Store authentication token from email verification

### Implementation:
```dart
Future<void> handleEmailVerificationComplete(String email, bool isExistingUser) async {
  if (isExistingUser) {
    // Existing user flow: Show data request modal, then return API URL
    showDataRequestModal(onComplete: (selectedData) {
      final apiUrl = 'https://api2.onairos.uk/user-data';
      final token = await getStoredJwtToken();
      onComplete(apiUrl, token, selectedData);
    });
  } else {
    // New user flow: Full onboarding
    showPlatformConnectorScreen(onComplete: () {
      showPinCreationScreen(onComplete: (pin) {
        storePinAfterBiometric(email, pin).then((_) {
          showTrainingModal(onComplete: () {
            final apiUrl = 'https://api2.onairos.uk/user-data';
            final token = await getStoredJwtToken();
            onComplete(apiUrl, token, userData);
          });
        });
      });
    });
  }
}
```

## 7. 🔐 Secure Storage Enhancements

### Enhanced Security:
- **Biometric protection**: PIN storage requires biometric authentication
- **Multiple token sources**: Check various storage keys for JWT tokens
- **Fallback mechanisms**: Mock storage for development environments

### Implementation:
```dart
class SecureStorageService {
  static const _storage = FlutterSecureStorage();
  
  static Future<void> storeCredentials(Map<String, dynamic> credentials) async {
    await _storage.write(
      key: 'onairos_credentials',
      value: jsonEncode(credentials),
      aOptions: AndroidOptions(
        encryptedSharedPreferences: true,
        biometricAuthenticationRequired: true,
      ),
      iOptions: IOSOptions(
        biometricAuthenticationRequired: true,
      ),
    );
  }
  
  static Future<String?> getStoredJwtToken() async {
    final tokenSources = [
      'email_verification_token',
      'onairos_jwt_token',
      'enoch_token',
      'auth_token',
    ];
    
    for (final source in tokenSources) {
      final token = await _storage.read(key: source);
      if (token != null && token.length > 20) {
        return token;
      }
    }
    
    return null;
  }
}
```

## 8. 🧪 Test Mode Integration

### Test Mode Features:
- **Mock responses**: Return success without real API calls
- **Simplified flow**: Skip complex validations in development
- **Easy testing**: Any 6-digit code works for email verification

### Implementation:
```dart
class OnairosTestMode {
  static bool isTestMode = false;
  
  static Future<Map<String, dynamic>> mockEmailVerification(String email) async {
    if (!isTestMode) return await realEmailVerification(email);
    
    return {
      'success': true,
      'message': 'Email verification sent successfully (test mode)',
      'requestId': 'test-request-${DateTime.now().millisecondsSinceEpoch}',
    };
  }
  
  static Future<Map<String, dynamic>> mockCodeVerification(String email, String code) async {
    if (!isTestMode) return await realCodeVerification(email, code);
    
    return {
      'success': true,
      'message': 'Email verification successful (test mode)',
      'existingUser': false,
      'jwtToken': 'test-jwt-token-${DateTime.now().millisecondsSinceEpoch}',
    };
  }
}
```

This comprehensive summary covers all the major changes you'll need to implement in your Flutter SDK to match the new React Native functionality. Each section includes the key concepts, API specifications, and implementation examples to help you recreate the same features in Flutter.