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.…