Commerce Platform

Commerce Platform

Designs, implements, and secures e-commerce workflows, shopping carts, checkout funnels, payment gateways, and inventory management for content management systems.

Phased Workflow

Phase 1: Architecture & Data Modeling

1. Model product catalog schemas (simple, variable, bundled products, tax categories, stock keeping units).
2. Design cart state synchronization (guest sessions, persistent user carts, Redis session caching).

Phase 2: Checkout & Payment Integration

1. Implement PCI-DSS compliant payment integration (Stripe Elements, PayPal SDK, Apple/Google Pay).
2. Ensure idempotent webhook handling for asynchronous order state transitions (charge.succeeded, payment_intent.failed).
3. Optimize checkout UX: reduce friction, enable 1-click checkout, simplify shipping calculation.

Phase 3: Performance, Security & Caching

1. Configure selective caching (exclude cart, checkout, account pages from Varnish/CDN cache).
2. Implement inventory locking during checkout to prevent double-selling under high concurrency.

Verification & Quality Checklist

• Payment credentials and webhook signing secrets stored in environment variables.
• Checkout forms validate inputs strictly and handle network drops gracefully.
• Cart endpoints protected against automated card testing (rate limiting + CAPTCHA).

Anti-Patterns & Constraints

• NEVER handle raw credit card numbers on your server (always use client-side tokenization / Hosted Fields).
• NEVER cache authenticated user checkout or cart responses on public CDNs.

References

Load these only when the task needs them:

• references/pci-dss-checklist.md