implementing logic & working example for app

example/lib/app/app.dart

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+import 'package:flutter/material.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+
+import 'core/router/router.dart';
+import 'core/theme/app_theme.dart';
+
+class App extends ConsumerWidget {
+  /// [App]
+  const App({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final appTheme = ref.read(appThemeProvider);
+    final router = ref.read(routerProvider);
+
+    return MaterialApp.router(
+      title: 'Easy Upi Payment',
+      theme: appTheme.lightTheme,
+      darkTheme: appTheme.darkTheme,
+      routeInformationParser: router.routeInformationParser,
+      routeInformationProvider: router.routeInformationProvider,
+      routerDelegate: router.routerDelegate,
+    );
+  }
+}

example/lib/app/core/local_storage/app_storage.dart

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+import 'package:hive_flutter/hive_flutter.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+
+class AppStorage {
+  // ignore: unused_field
+  Box? _box;
+
+  /// for initialling app local storage
+  Future<void> initAppStorage() async {
+    await Hive.initFlutter();
+    // TODO: add your storage name here
+    _box = await Hive.openBox('hello world');
+  }
+
+  // example of storing & getting value
+
+  /// for storing uploaded string value
+  final String _upiId = 'upiId';
+
+  /// for getting string from box
+  String? getUpiId() {
+    return _box?.get(_upiId) as String?;
+  }
+
+  /// for storing upiId to app
+  Future<void> putUpiId(String upiId) async {
+    await _box?.put(_upiId, upiId);
+  }
+
+  /// for storing uploaded string value
+  final String _name = 'name';
+
+  /// for getting string from box
+  String? getName() {
+    return _box?.get(_name) as String?;
+  }
+
+  /// for storing name to app
+  Future<void> putName(String name) async {
+    await _box?.put(_name, name);
+  }
+
+  /// for storing uploaded string value
+  final String _amount = 'amount';
+
+  /// for getting string from box
+  String? getAmount() {
+    return _box?.get(_amount) as String?;
+  }
+
+  /// for storing upiId to app
+  Future<void> putAmount(String amount) async {
+    await _box?.put(_amount, amount);
+  }
+
+  /// for storing uploaded string value
+  final String _description = 'description';
+
+  /// for getting string from box
+  String? getDescription() {
+    return _box?.get(_description) as String?;
+  }
+
+  /// for storing upiId to app
+  Future<void> putDescription(String description) async {
+    await _box?.put(_description, description);
+  }
+
+  /// for clearing all data in box
+  Future<void> clearAllData() async {
+    await _box?.clear();
+  }
+}
+
+final appStorageProvider = Provider<AppStorage>(
+  (_) {
+    throw UnimplementedError();
+  },
+);

example/lib/app/core/router/router.dart

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+import 'package:go_router/go_router.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+
+import '../../features/main/view/main_view.dart';
+
+///
+/// for getting routers that are present in the app
+///
+final routerProvider = Provider<GoRouter>(
+  (ref) {
+    return GoRouter(
+      initialLocation: MainView.routeName,
+      routes: [
+        GoRoute(
+          path: MainView.routeName,
+          builder: (context, state) => const MainView(),
+        ),
+      ],
+    );
+  },
+);

example/lib/app/core/theme/app_theme.dart

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+import 'package:flex_color_scheme/flex_color_scheme.dart';
+import 'package:flutter/material.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+
+class AppTheme {
+  /// for getting light theme
+  ThemeData get lightTheme {
+    return FlexThemeData.light(
+      scheme: FlexScheme.green,
+    );
+  }
+
+  /// for getting dark theme
+  ThemeData get darkTheme {
+    return FlexThemeData.dark(
+      scheme: FlexScheme.green,
+    );
+  }
+}
+
+/// for providing app theme [AppTheme]
+final appThemeProvider = Provider<AppTheme>((_) => AppTheme());

example/lib/app/features/main/providers/main_providers.dart

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+import 'package:easy_upi_payment/easy_upi_payment.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+
+class MainStateNotifier extends StateNotifier<MainState> {
+  MainStateNotifier() : super(MainState.initial);
+
+  TransactionDetailModel? transactionDetailModel;
+
+  /// for starting payment
+  Future<void> startPayment(EasyUpiPaymentModel model) async {
+    state = MainState.loading;
+    try {
+      //
+      final res = await EasyUpiPaymentPlatform.instance.startPayment(model);
+      if (res != null) {
+        transactionDetailModel = res;
+        state = MainState.success;
+      } else {
+        state = MainState.error;
+      }
+    } on EasyUpiPaymentException {
+      state = MainState.error;
+    }
+  }
+}
+
+final mainStateProvider = StateNotifierProvider.autoDispose<MainStateNotifier, MainState>(
+  (ref) {
+    return MainStateNotifier();
+  },
+);
+
+enum MainState {
+  initial,
+  loading,
+  success,
+  error,
+}