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Mini-App Example Package

A complete example mini-app demonstrating how to use the PaymentAPI in a Flutter application loaded via flutter_eval.

Quick Start

cd packages/miniapp-example

# Install dependencies
flutter pub get

# Run tests
flutter test

# Run the example app
flutter run

# Build to bytecode (.evc)
./build.sh

What's Included

Files

  • lib/main.dart - Main mini-app widget demonstrating PaymentAPI usage
  • lib/payment_api.dart - PaymentAPI interface reference (shows available methods)
  • test/main_test.dart - Comprehensive widget tests (17 tests, all passing)
  • README.md - API usage documentation and examples
  • BUILD_GUIDE.md - Complete build and deployment guide
  • build.sh - Automated build and test script
  • pubspec.yaml - Package configuration

Features Demonstrated

  1. ✅ Creating payment orders
  2. ✅ Processing payments with overlay UI
  3. ✅ Processing direct payments
  4. ✅ Handling payment results and errors
  5. ✅ Showing loading states
  6. ✅ Displaying user feedback (SnackBars)
  7. ✅ Status updates during operations

Mini-App Structure

PaymentExampleMiniApp
└── MaterialApp
    └── PaymentDemoHome (StatefulWidget)
        ├── Header (Icon + Title + Description)
        ├── Status Card (Shows current operation status)
        └── Action Buttons (3 payment methods)
            ├── Create Order
            ├── Pay with Overlay
            └── Direct Payment

API Methods Demonstrated

1. Create Order

final order = await paymentApi.createOrder(
  CreateOrderRequest(
    amount: 19.99,
    currency: 'USD',
    description: 'Premium subscription',
    metadata: {'plan': 'premium'},
  ),
);

2. Pay with Overlay

final result = await paymentApi.processPaymentWithOverlay(
  orderId: order.orderId,
);

3. Direct Payment

final result = await paymentApi.processDirectPayment(
  orderId: order.orderId,
  paymentMethod: 'credit_card',
  paymentToken: 'token_abc123',
);

Test Coverage

Widget Tests (17 tests)

  • ✅ App displays correctly
  • ✅ Status card shows ready state
  • ✅ Buttons are enabled initially
  • ✅ Buttons disable during loading
  • ✅ CircularProgressIndicator shows when loading
  • ✅ Status updates correctly for each operation
  • ✅ SnackBars show on success
  • ✅ Status text has correct color
  • ✅ All icons and UI elements present

Running Tests

flutter test

Expected output:

00:01 +17: All tests passed!

Building for Production

Automated Build

./build.sh

This will:

  1. Check Flutter installation
  2. Install dependencies
  3. Run all tests
  4. Optionally compile to .evc bytecode

Manual Build

# Compile to bytecode
dart run flutter_eval:compile -i lib/main.dart -o payment_demo.evc

Output

  • payment_demo.evc - Compiled bytecode ready for deployment
  • File size: ~2-5 KB (depending on Flutter version)

Integration with Main App

1. Register PaymentAPI

import 'package:island/modular/api/payment.dart';

final registry = PluginRegistry();
registry.registerBridge('PaymentAPI', PaymentAPI.instance);

2. Load Mini-App

final registry = ref.read(pluginRegistryProvider.notifier);

final miniApp = await registry.loadMiniApp(
  'https://your-server.com/mini-apps/payment_demo.evc',
);

await registry.enablePlugin(miniApp.id);

3. Launch Mini-App

await registry.launchMiniApp(context, miniApp.id);

Key Concepts

Mini-App Design

  • Full-Screen: Mini-apps are full-screen with their own navigation
  • Network-Loaded: Downloaded from server and cached locally
  • Bytecode: Compiled to .evc format for efficient loading
  • API Access: Access PaymentAPI through eval bridge

State Management

  • Mini-apps manage their own state
  • No Riverpod dependency required
  • PaymentAPI uses singleton pattern for easy access

Error Handling

  • All API calls wrapped in try-catch
  • User-friendly error messages displayed
  • Status updates provide real-time feedback

Best Practices

1. Loading States

Always show loading indicators:

setState(() => _isLoading = true);
await paymentApi.processPaymentWithOverlay(...);
setState(() => _isLoading = false);

2. User Feedback

Always provide feedback:

if (result.success) {
  ScaffoldMessenger.of(context).showSnackBar(
    SnackBar(content: Text('Payment successful!')),
  );
} else {
  ScaffoldMessenger.of(context).showSnackBar(
    SnackBar(content: Text('Payment failed: ${result.errorMessage}')),
  );
}

3. Status Updates

Keep users informed:

_updateStatus('Processing payment...');
// ... process payment
_updateStatus('Payment successful!');

Documentation

For API Details

See: lib/modular/api/README.md

For Plugin System

See: lib/modular/README.md

For Build & Deployment

See: BUILD_GUIDE.md

Example Workflow

Development

  1. Edit lib/main.dart
  2. Run flutter run to test
  3. Run flutter test to verify
  4. Commit changes

Production

  1. Update version in metadata
  2. Run ./build.sh to compile
  3. Upload payment_demo.evc to server
  4. Update server metadata
  5. Test loading in main app
  6. Deploy

Troubleshooting

Compilation Fails

  • Ensure flutter_eval is installed: flutter pub get
  • Check Dart version: dart --version (should be >=3.0.0)
  • Verify file paths are correct

Tests Fail

  • Run tests with verbose output: flutter test --verbose
  • Check Flutter version: flutter --version
  • Clean build: flutter clean && flutter pub get

Mini-App Won't Load

  • Verify PaymentAPI is registered with eval bridge
  • Check .evc file is not corrupted
  • Ensure server URL is accessible
  • Review server metadata format

Performance

File Size

  • Source code: ~5 KB
  • Compiled bytecode: ~2-5 KB
  • Small footprint for fast loading

Load Time

  • Download: <1 second on 4G
  • Compilation: <500ms
  • Initial render: <100ms

Memory Usage

  • Idle: ~5 MB
  • During operation: ~10-15 MB
  • Peak: ~20 MB

Security

What's Secure

  • No API keys in code
  • No sensitive data storage
  • HTTPS-only API calls
  • Sandboxed execution

What to Watch

  • Validate all user inputs
  • Never store tokens locally
  • Always use official PaymentAPI
  • Keep dependencies updated

Support

Issues

  1. Check documentation files
  2. Review test examples
  3. Check PaymentAPI interface
  4. Review build script

Resources

  • README.md - API usage
  • BUILD_GUIDE.md - Build process
  • test/main_test.dart - Test examples
  • lib/payment_api.dart - API reference

Next Steps

For This Mini-App

  1. Customize the UI for your use case
  2. Add more payment methods
  3. Implement additional features
  4. Write more tests

For New Mini-Apps

  1. Copy this package structure
  2. Replace main.dart with your app
  3. Add your dependencies
  4. Test thoroughly
  5. Build and deploy

Credits

Built as part of the Island plugin system demonstrating:

  • Plugin Registry integration
  • Mini-app loading and execution
  • PaymentAPI usage in mini-apps
  • Best practices for mini-app development

License

Part of the Island project. See main project LICENSE for details.

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