Ecommerce

**Judgement:** This skill appears to be a strong, pragmatic resource for building and running ecommerce stores, with above-average depth on payment correctness, inventory integrity, and CRO. It is best suited for developers, technical founders, and operators who need production-grade patterns rather than high-level marketing advice. **What it does well** - Emphasizes **critical production traps** (payment idempotency, inventory race conditions, trusting frontend prices, webhook signature verification) with concrete implementation hints. - Provides **clear core rules** (all prices server-side, transactional emails queued, Schema.org structured data, canonical URLs) that are broadly applicable across platforms. - Addresses **operations** (stock thresholds, stuck orders, logging payment failures) and **growth** (cart recovery cadences, free shipping thresholds, mobile UX standards) in a very actionable way. - Includes a **platform decision tree** and notes on **EU/Spain specifics**, which help narrow platform and architecture choices in real-world constraints. **Key risks / limitations** - Guidance is **opinionated and generic**: real implementations will vary by gateway, platform, and jurisdiction. Blindly copying patterns without adapting to specific APIs (e.g., Stripe vs. other PSPs) or business rules can still produce bugs or financial leakage. - Legal and fiscal advice is **regionally biased toward EU/Spain**; using it as-is for other jurisdictions risks compliance gaps (tax handling, consumer protection, data privacy). - It describes **how to implement** patterns but does not execute or verify anything. Incorrect implementation (e.g., flawed idempotency keys, misconfigured webhooks, wrong SQL conditions) can still cause double-charging, overselling, or security issues. - Market practices, carrier options, and platform pricing evolve; relying on this skill alone without **current local verification** can lead to outdated cost assumptions or suboptimal platform choices. **Recommended scenarios** - Designing or refactoring an ecommerce backend to make payments idempotent, inventory updates race-safe, and webhooks secure. - Choosing between Shopify, WooCommerce, or custom builds under concrete constraints (budget, SKU count, marketplace and ERP needs). - Improving an existing store’s **conversion rate** via checkout recovery flows, free shipping thresholds, and mobile-first UX changes. - Setting up **operational monitoring and alerting** around stock, stuck orders, and payment failures to avoid revenue loss and customer dissatisfaction. - Planning or operating stores serving **EU/Spain** where tax, shipping, and legal nuances matter. Use this skill as a **technical and operational blueprint**, but pair it with up-to-date documentation from your chosen payment providers, platforms, and local legal/tax advisors before going live at scale.