Integrating Revenuecat

RevenueCat (Flutter) Latest Version Best Practices Guide (v10.x)

Goal

RevenueCat is the industry-standard solution for handling In-App Purchases (IAP) and subscriptions in mobile applications. In Flutter, the official package is purchases_flutter (paired with purchases_ui_flutter for pre-built paywall UI).

Instructions

1. Core Concept: Entitlements > Products

In traditional IAP development, developers often focus on "which Product ID the user purchased." RevenueCat's best practice is: Always check the user's Entitlements.

• Products: The actual items configured in Apple/Google consoles (e.g., monthly_sub_199).
• Offerings: RevenueCat packages multiple Products into a display offering (e.g., a default offering contains "Monthly" and "Annual" subscriptions). This makes A/B testing extremely easy, allowing you to swap products without changing the APP code.
• Entitlements: The ultimate goal unlocked after a user purchases (e.g., pro_access).

👉 Your APP logic should ALWAYS only check if pro_access is active. Do not care about which offering the user bought to get it.

2. Dependencies and Initialization Setup

2.1 Install Packages

dependencies:
  purchases_flutter: ^10.0.1
  # 🌟 Highly Recommended: Use the official native UI checkout templates (Paywalls) to reduce the pain of building your own UI
  purchases_ui_flutter: ^10.0.1 

2.2 Platform Specific Configurations (Extremely Important)

• Android (AndroidManifest.xml): Be sure to set the main Activity's launchMode to singleTask or singleTop. Otherwise, unexpected behaviors like canceled purchases might occur when the user switches back from the Google Play payment screen.
• iOS: Ensure Xcode 14.0+, and the deployment target is generally recommended to be iOS 13.0+.

2.3 Initialization (On App Startup)

Complete the initialization as early as possible, either in main() or before the App UI renders.

import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:purchases_flutter/purchases_flutter.dart';

Future<void> initPlatformState() async {
  await Purchases.setLogLevel(kDebugMode ? LogLevel.debug : LogLevel.info);

  PurchasesConfiguration? configuration;
  if (Platform.isAndroid) {
    // Android natively uses a Builder underneath; just provide the API Key in Flutter
    configuration = PurchasesConfiguration('goog_api_key_here');
  } else if (Platform.isIOS) {
    configuration = PurchasesConfiguration('appl_api_key_here')
      // 🌟 v7+ Best Practice: Explicitly define StoreKit version (defaults to auto-select, but StoreKit 2 requires In-App Purchase Key configurations in your RevenueCat Dashboard)
      ..storeKitVersion = StoreKitVersion.storeKit2; 
  }
  
  if (configuration != null) {
    // 🌟 Best Practice: Pass your own user ID here to help RevenueCat sync across devices.
    // configuration.appUserID = "my_app_user_id";

    // ⚠️ Deprecation Notice: "Observer Mode" is now legacy. If your App fundamentally completes its own transactions (instead of RevenueCat), deploy:
    // configuration.purchasesAreCompletedBy = PurchasesAreCompletedByMyApp(storeKitVersion: StoreKitVersion.storeKit2);

    await Purchases.configure(configuration);
  }
}

[!WARNING] v10.0 Breaking Change — Min Android SDK 21 → 23: purchases_flutter v10 updates to Billing Library 8.3.0, raising the minimum Android SDK from API 21 to API 23 (Android 6). Update your android/app/build.gradle:

defaultConfig {
    minSdkVersion 23  // was 21 in v9
}

CRITICAL: If your App offers "Lifetime Unlock" products without a backend account system, you MUST strictly configure them as Non-consumable inside the RevenueCat dashboard. If labeled as consumable, RevenueCat consumes them instantly, and users will permanently lose the ability to restorePurchases! This workaround (available in v9) is completely removed in v10.

3. Checking Entitlements and State Management (Best Practices)

Integrate RevenueCat's state into your state management (like Riverpod / Bloc) to drive UI unlocking.

// Using Riverpod as an example
final customerInfoProvider = FutureProvider<CustomerInfo>((ref) async {
  // Get the latest state
  return await Purchases.getCustomerInfo();
});

final isProUserProvider = Provider<bool>((ref) {
  final customerInfo = ref.watch(customerInfoProvider).valueOrNull;
  if (customerInfo == null) return false;
  
  // 🌟 Best Practice: Only verify if the entitlement is active
  return customerInfo.entitlements.all['pro_access']?.isActive == true;
});

Besides the initial fetch, it's recommended to listen for customer info changes (e.g., successful background renewals):

Purchases.addCustomerInfoUpdateListener((customerInfo) {
  // Update your global state (e.g., notify Bloc or invalidate Riverpod provider)
  // ref.invalidate(customerInfoProvider);
});

4. Checkout and Displaying the Paywall

RevenueCat's strength lies in its ability to let you remotely control what to sell.

4.1 Using the Official Paywall (Fastest, Most Stable)

Through purchases_ui_flutter, you can directly summon the paywall designed in the RevenueCat console, saving you the time of building the UI.

import 'package:purchases_ui_flutter/purchases_ui_flutter.dart';

Future<void> showPaywall(BuildContext context) async {
  // Presents a full-screen Paywall meticulously designed in the RevenueCat Dashboard
  final paywallResult = await RevenueCatUI.presentPaywall();
  
  if (paywallResult == PaywallResult.purchased) {
    // Purchase successful, update state and close the wall
  }
}

4.2 Customer Center (v9+ New Feature)

RevenueCatUI now encompasses a full-fledged robust Customer Center interface natively empowering users to manage subscriptions, cancel, or seek refunds autonomously without developers coding management screens.

// Launch the autonomous subscription management center directly 
await RevenueCatUI.presentCustomerCenter();

4.3 Custom Paywall

If you need complete customization, fetch the Offerings and manually call the purchase method:

Future<void> purchasePackage(Package package) async {
  try {
    // Execute purchase. ⚠️ v9 Breaking Change: Now returns `PurchaseResult` encapsulating `customerInfo` and `storeTransaction` instead of exposing `CustomerInfo` directly.
    PurchaseResult result = await Purchases.purchasePackage(package);
    
    // 🌟 Principle: Still check the Entitlement after purchase leveraging the extracted customerInfo!
    final isPro = result.customerInfo.entitlements.all['pro_access']?.isActive == true;
    if (isPro) {
      // Successfully unlocked!
    }
  } on PlatformException catch (e) {
    // 🌟 Officially endorsed error interception approach
    var errorCode = PurchasesErrorHelper.getErrorCode(e);
    if (errorCode != PurchasesErrorCode.purchaseCancelledError) {
      // Show error to the user
    }
  }
}

4.4 Web Redemption (Flutter Web)

RevenueCat v9 integrates Web Billing smoothly. You must parse WebPurchaseRedemptionResult exhaustively through switch:

  switch (result) {
    case WebPurchaseRedemptionSuccess(:final customerInfo):
      // Redeemed successfully
      break;
    case WebPurchaseRedemptionError(:final error):
      // Redemption failed
      break;
    case WebPurchaseRedemptionPurchaseBelongsToOtherUser():
      // Already tied to another user
      break;
    case WebPurchaseRedemptionInvalidToken():
    case WebPurchaseRedemptionExpired(:final obfuscatedEmail):
      // Validation failures
      break;
  };

5. Restore Purchases

Apple mandates that Apps must provide a "Restore Purchases" button.

try {
  CustomerInfo customerInfo = await Purchases.restorePurchases();
  // Check entitlements as usual
  if (customerInfo.entitlements.all['pro_access']?.isActive == true) {
     // Restore successful
  }
} catch (e) {
  // Handle error
}

6. Summary

1. Abandon local receipt validation: Hand this over 100% to RevenueCat.
2. Decouple logic from products: In your code, only check entitlements through CustomerInfo. Do not hardcode any product IDs.
3. Login Integration: If your App has its own account system, remember to call Purchases.logIn(userId) after login to ensure cross-device purchase history can be bound to your account.

Constraints

• Always check entitlements.all['your_entitlement']?.isActive instead of checking the presence of active subscriptions or product IDs.
• Ensure you configure the Purchases singleton before making any other RevenueCat calls.
• v10+ Android: minSdkVersion must be 23 or higher. Apps still targeting API 21/22 must remain on v9.

Old Patterns (pre-v10)

# purchases_flutter v9.x — supports Android API 21+
dependencies:
  purchases_flutter: ^9.13.1
  purchases_ui_flutter: ^9.13.1

In v9, a workaround allowed restoring consumed one-time products on Android. This workaround is removed in v10. If you relied on it, configure those products as non-consumable in the RevenueCat dashboard before upgrading.