System Design Global Payment Processing | Paypal

In this in-depth video, we explore the architecture of a global payment system designed to handle high transaction volumes for both merchants and consumers. We'll break down each component—from payment gateways to the service layer and data management, highlighting security, scalability, and low latency. This video is perfect for engineers, developers, and anyone preparing for system design interviews at top tech companies.

0:00 – Introduction: Overview of Global Payment System Design

1:25 – Clarifying Requirements: Scope, users, transactions, and compliance

2:16 – System Goals: High availability, scalability, security, and low latency

2:46 – High-Level Architecture: Client Layer, Service Layer, and Data Layer

3:48 – Client Layer: User interactions and API consumers

4:25 – Service Layer Overview: Core services, microservices, and business logic

4:45 – Payment Gateway vs Payment Processor: Roles and interactions

7:14 – Data Layer: Database choices and structure for scalability

7:51 – Database Per Service: User, Account, Payment, Transaction, Fraud Detection

12:13 – Detailed Component Interaction: Flow from authentication to payment processing

18:55 – Resilient Microservice Patterns: Circuit Breaker, Retry, Idempotency, and Saga

20:26 – Security Measures: Encryption, access control, and fraud detection

21:11 – Scalability and Performance Optimization: Load balancing, caching, and sharding

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AWS Certification:

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