| 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
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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
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
