How POS Apps Communicate with the Backend Kotlin Tutorial

Ever wondered what happens when you swipe a card on a POS machine? 🤔 In this Kotlin tutorial, we’ll break down exactly how POS apps communicate with backend servers — from building requests, encrypting sensitive data, sending them via APIs, and displaying real-time responses. Whether you’re a Kotlin beginner, a mobile developer, or just curious about fintech systems, this video will give you hands-on knowledge you can apply immediately. 📌 What you’ll learn: How POS apps send data to backend servers Request → Encrypt → Send → Receive → Display cycle Kotlin code for Retrofit API calls Implementing RSA encryption in Kotlin Using ViewModel + LiveData for transaction results Link to the MVVM tutorial video: https://www.youtube.com/watch?v=b1z29Z8jlHA&t=2s #fintech #kotlin #kotlinprogramming #kotlintutorials #agencybanking