Скачать или смотреть How Online Payments Work: Webhooks, Idempotency & System Design

Master the architecture behind secure online payments. From Webhooks to Idempotency, learn how money actually moves across the internet.
Have you ever wondered what happens in the milliseconds between clicking "Purchase" and seeing "Order Confirmed"? It’s not just magic—it’s a complex orchestration of distributed systems.

In this video, we break down the backend system design of payment processing. We move beyond simple API calls to understand the fault-tolerant mechanisms that keep the global economy running. We explore why you shouldn't build your own payment processor, how services like Stripe and PayPal handle the heavy lifting, and the two critical concepts every backend engineer must know: Webhooks and Idempotency.

If you are building a SaaS, an e-commerce platform, or just want to crack your next System Design interview, this breakdown is for you.

⏱️ Timestamps: 0:00 - The complexity of the "Buy" button 0:27 - The moving parts of a transaction 0:57 - Why we use Stripe & PayPal (Infrastructure) 1:20 - The Transaction Lifecycle 2:00 - Webhooks explained (Event-driven architecture) 2:12 - The "Double Charge" problem 2:33 - What is Idempotency? 2:50 - Security: PCI Compliance & Tokenization 3:23 - The full system architecture recap