What problem does it solve? Building an online store involves many architectural decisions across backend modules, storefront UX, and payment security. This Skill provides consolidated standards for designing scalable, secure e-commerce systems so teams avoid common pitfalls in checkout design, cart state, and payment compliance. ## Core Features & Use Cases - MedusaJS Backend Standards: Guidance on custom modules, module links, workflows for long-running processes like order fulfillment, and extending core entities. - Storefront Patterns: Patterns for multi-step checkout flows, product discovery with Meilisearch or Algolia, and local/server cart synchronization. - Payments & Security: Integration practices for Stripe and PayPal plugins, webhook handling, PCI DSS compliance, and fraud prevention via rate limiting. - Use Case: When building a new storefront on MedusaJS, use this Skill to structure the checkout flow, wire up Stripe webhooks, and ensure no card data touches your servers. ## Quick Start Ask the agent to design a MedusaJS checkout flow with Stripe payment integration and cart persistence for your store.