shopping-cart

id	SKL-shopping-SHOPPINGCART
name	Shopping Cart
description	A shopping cart is a critical component of any e-commerce system, allowing users to collect items for purchase. This guide covers various cart architectures and implementations, including guest carts,
version	1.0.0
status	active
owner	@cerebra-team
last_updated	2026-02-22
category	Backend
tags	["api","backend","server","database"]
stack	["Python","Node.js","REST API","GraphQL"]
difficulty	Intermediate

Shopping Cart

Skill Profile

(Select at least one profile to enable specific modules)

• DevOps
• Backend
• Frontend
• AI-RAG
• Security Critical

Overview

A shopping cart is a critical component of any e-commerce system, allowing users to collect items for purchase. This guide covers various cart architectures and implementations, including guest carts, logged-in user carts, cart persistence, and cart abandonment tracking.

Why This Matters

• Conversion Rate: Smooth cart experience increases conversion
• User Experience: Persistent carts reduce friction
• Revenue Recovery: Cart abandonment emails recover lost sales
• Data Accuracy: Real-time price calculations prevent surprises

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Core Concepts & Rules

1. Core Principles

• Follow established patterns and conventions
• Maintain consistency across codebase
• Document decisions and trade-offs

2. Implementation Guidelines

• Start with the simplest viable solution
• Iterate based on feedback and requirements
• Test thoroughly before deployment

Inputs / Outputs / Contracts

• Inputs:
  • Product ID and variant ID
  • Quantity
  • Coupon codes
  • User ID or session ID
• Entry Conditions:
  • Product catalog available
  • Session management configured
  • Database or Redis for cart storage
• Outputs:
  • Cart with items and totals
  • Validation results
  • Applied discounts
  • Updated cart state
• Artifacts Required (Deliverables):
  • Cart management API
  • Cart state service
  • Cart validation logic
  • Cart abandonment tracking