Grokking the System Design Interview, Volume II
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Payment System: High-Level Design

Step 4: High-Level System Design

Architecture Overview

  • API Gateway / Load Balancer: Serves as the entry point for all requests. It handles authentication, rate limiting, and routing to internal services.

  • Payment Service (or Payment Processing Service): The core backend service that handles the main payment logic. This service (which could itself be composed of multiple microservices, but initially think of it as one logical unit) is responsible for orchestrating a payment request

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