StoreKit2 Plugin Documentation

The StoreKit2Plugin is a Flutter plugin for handling in-app purchases and subscriptions using Apple's StoreKit 2 API. It supports initializing transactions, fetching products, making purchases, checking subscriptions, and retrieving purchase history.

Installation

1. Add the dependency to your pubspec.yaml file:

   dependencies:
     storekit2helper:
    

2. Import the plugin:

   import 'package:storekit2helper/storekit2helper.dart';

Usage

Initialize

Initialize transaction updates:

  Storekit2Helper.initialize();

Fetch Products

Fetch available products:

final products = await Storekit2Helper.fetchProducts(productIDs: ["com.example.product1", "com.example.product2"]);

Purchase Product

Purchase a product:

  Storekit2Helper.buyProduct(productID:"app_weekly",
        (success, transaction, errorMessage) {
      print(success);
      print(errorMessage);
      print(transaction);
    });

Check Active Subscription

Check if the user has an active subscription:

final hasActiveSubscription = await Storekit2Helper.hasActiveSubscription();

Fetch Purchase History

Retrieve purchase history:

final purchaseHistory = await Storekit2Helper.fetchPurchaseHistory();

Example

import 'package:flutter/material.dart';
import 'package:storekit2helper/storekit2helper.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
    Storekit2Helper.initialize();

  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: StoreKitExample(),
    );
  }
}

class StoreKitExample extends StatefulWidget {
  @override
  State<StoreKitExample> createState() => _StoreKitExampleState();
}

class _StoreKitExampleState extends State<StoreKitExample> {
  List<dynamic> products = [];
  bool hasActiveSubscription = false;

  @override
  void initState() {
    super.initState();
    fetchProducts();
    checkSubscription();
  }

  Future<void> fetchProducts() async {
    final productIDs = ["com.example.product1", "com.example.product2"];
    final fetchedProducts = await Storekit2Helper.fetchProducts(productIDs: productIDs);
    setState(() {
      products = fetchedProducts;
    });
  }

  Future<void> checkSubscription() async {
    final isActive = await Storekit2Helper.hasActiveSubscription();
    setState(() {
      hasActiveSubscription = isActive;
    });
  }

  Future<void> purchaseProduct(String productId) async {
    try {
     

  Storekit2Helper.buyProduct(productId,
        (success, transaction, errorMessage) {
      print(success);
      print(errorMessage);
      print(transaction);
    });


    } catch (e) {
      print("Purchase Failed: $e");
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("StoreKit2 Example")),
      body: Column(
        children: [
          Text("Active Subscription: $hasActiveSubscription"),
          Expanded(
            child: ListView.builder(
              itemCount: products.length,
              itemBuilder: (context, index) {
                final product = products[index];
                return ListTile(
                  title: Text(product['title']),
                  subtitle: Text(product['localizedPrice']),
                  onTap: () => purchaseProduct(product['productId']),
                );
              },
            ),
          ),
        ],
      ),
    );
  }
}

Notes

• Ensure your productIDs match those configured in App Store Connect.
• Handle errors gracefully to provide a seamless experience.
• This plugin requires iOS 15.0 or later.