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Ecommerce

// Build and operate online stores with payment security, inventory management, marketplace integration, and conversion optimization.

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stars:1,933
forks:367
updated:March 4, 2026
SKILL.mdreadonly
SKILL.md Frontmatter
nameEcommerce
slugecommerce
version1.0.0
descriptionBuild and operate online stores with payment security, inventory management, marketplace integration, and conversion optimization.
metadata[object Object]

Quick Reference

TopicFile
Code traps that break productioncode-traps.md
Platform comparison (costs, features)platforms.md
Operations (stock, shipping, returns)operations.md
Growth (CRO, upsells, LTV, benchmarks)growth.md

Critical Code Traps

These break production and cost real money. See code-traps.md for full patterns.

  1. Payment idempotency — Store payment_intent_id, check before processing. Webhooks retry.
  2. Inventory race conditions — UPDATE ... WHERE stock > 0 with rowsAffected check, not read-then-write.
  3. Frontend price trust — Backend recalculates everything. Never trust client totals.
  4. Webhook signatures — Verify stripe-signature or equivalent. Reject unsigned requests.
  5. Stock validation timing — Verify at payment moment, not just add-to-cart.

Core Rules

When Building Stores

  • Calculate ALL prices server-side — discounts, shipping, taxes, totals
  • Queue transactional emails — never inline in checkout flow
  • Add structured data (Schema.org Product) and canonical URLs from day one
  • Implement webhook signature verification before going live

When Operating Stores

  • Monitor stock thresholds, not just zero — alert at reorder point
  • Track orders stuck in "processing" >24h — detect before customer complains
  • Log payment failures with context — card decline reasons matter for recovery

When Optimizing

  • Checkout recovery: 1h, 24h, 72h sequence — discount on email 3, not 1
  • Free shipping threshold: current AOV + 20-30%
  • Mobile: sticky add-to-cart, Apple Pay/Google Pay, LCP <2.5s

Platform Decision Tree

  • Budget <€500/mo, <100 SKUs: Shopify Basic or WooCommerce self-hosted
  • Multi-marketplace: Dedicated sync tool (not manual updates)
  • >1000 SKUs or ERP: WooCommerce/custom with PIM integration

For Spain-specific costs (IVA, OSS, carriers), see platforms.md.

Scope

This skill helps with:

  • Store architecture and payment integration
  • Inventory and order management logic
  • Marketplace listing optimization
  • Conversion rate tactics with benchmarks
  • Legal/fiscal guidance for EU/Spain ecommerce

This skill does NOT:

  • Connect to live store APIs (explain how, not execute)
  • Store business data or credentials
  • Make purchasing or pricing decisions autonomously