Introduction

If you’re building a SaaS or premium mobile app, subscriptions are one of the most reliable monetization models.

But implementing subscriptions correctly is not just about adding a payment button — it involves:

Secure validation

Real-time status updates

Handling edge cases (expiry, restore, refunds) In this guide, I’ll walk you through how I implemented a production-ready subscription system using FlutterFlow + RevenueCat + Firebase.

💰 Why RevenueCat?

Instead of directly handling App Store / Play Store billing , I used RevenueCat because it simplifies everything.

Key Benefits:

✅ Single integration for both iOS & Android

✅ Handles receipts, validation, and renewals

✅ Real-time subscription status via webhooks

✅ Reduces development complexity 👉 Without RevenueCat, managing subscriptions manually becomes very complex.

🏗️ System Architecture (Simple View)

Here’s how the system works:

FlutterFlow App (Frontend)

→ User interacts with UI (Upgrade, Restore)

RevenueCat SDK

→ Handles…