Build Payment Gateway System | System Design
Welcome to Lecture 23 of the Ultimate Low-Level Design (LLD) Series by Coder Army!
fifth week for #lowleveldesign #systemdesign #8weeksLLdchallenge.
We are doing 8 weeks challenge and going to complete the whole course within the duration with quality content on Youtube. Let’s learn LLD like never before and attain advance level mastery on this subject.
In this lecture, we’ll design and implement a Payment Gateway System from scratch using Low-Level Design principles in C++ & Java. You’ll see how to combine multiple design patterns—Strategy, Template Method, Proxy, Factory, and Singleton—to create a robust, extensible, and maintainable architecture.
What You’ll Learn:
Strategy Pattern for pluggable banking systems (Paytm, Razorpay)
Template Method Pattern to define the payment workflow skeleton
Proxy Pattern to add retry logic transparently
Factory & Singleton Patterns for gateway creation and global access
How the Controller orchestrates requests end-to-end
UML Diagrams & live coding walkthrough in C++
By the end of this video, you'll understand how to decompose a complex system into clean, pattern-driven components—and you’ll be able to apply these principles to any real-world project.
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Code and Notes: Github : https://github.com/adityatandon15/LLD
Connect with Aditya Tandon
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00:00 Introduction
01:28 Requirements Analysis
07:08 Happy Flow
09:14 What is Payment gateway
12:31 Back to Flow Discussion
13:25 UML Design
44:19 Code for Payment Gateway
58:21 Further Enhancements
#SystemDesign #LowLevelDesign #LLD #AdapterPattern #DesignPatterns #Cplusplus #JavaDevelopers #UMLDiagrams #TechInterviews #SoftwareEngineering #XMLtoJSON #CleanCode #SoftwareArchitecture #ObjectOrientedDesign #CodingWithExamples #CodeBetter #8WeeksLLDChallenge #JSON
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