Medusa v2 Cart and Checkout

Before writing code

Fetch live docs:

1. Web-search site:docs.medusajs.com cart module for cart data model and service methods
2. Web-search site:docs.medusajs.com checkout flow for the end-to-end checkout process
3. Web-search site:docs.medusajs.com sales channel for sales channel scoping
4. Fetch https://docs.medusajs.com/resources/references/cart and review the ICartModuleService interface
5. Web-search medusajs v2 cart workflow 2026 for latest cart-related workflow steps

Cart Lifecycle

Flow

Create Cart ──> Add Line Items ──> Set Address
  ──> Select Shipping ──> Init Payment ──> Complete