Complete Guide to In-App Subscriptions with RevenueCat & Flutter

Monetizing mobile apps through subscription models (Mobile Micro-SaaS) provides predictable, high-margin Recurring Revenue (MRR). However, building custom StoreKit 2 and Google Play Billing integrations from scratch is notoriously time-consuming and error-prone. RevenueCat is the global industry standard to implement subscriptions in hours.

1. Implementation Code in Flutter

import 'package:purchases_flutter/purchases_flutter.dart';

class SubscriptionService {
  static Future init(String userId) async {
    await Purchases.setLogLevel(LogLevel.debug);
    
    PurchasesConfiguration configuration = PurchasesConfiguration('appl_your_api_key_here')
      ..appUserID = userId;
      
    await Purchases.configure(configuration);
  }

  static Future purchasePremium(Package package) async {
    try {
      final customerInfo = await Purchases.purchasePackage(package);
      if (customerInfo.entitlements.all['premium_access']?.isActive ?? false) {
        return true;
      }
    } on PlatformException catch (e) {
      final errorCode = PurchasesErrorHelper.getErrorCode(e);
      if (errorCode != PurchasesErrorCode.purchaseCancelledError) {
        print('Purchase error: ${e.message}');
      }
    }
    return false;
  }
}