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Implement the UCP Discount extension — discount code application, validation, allocation tracking, and error handling. Use when adding promo code or discount logic to a UCP checkout.

Navigate Spree's canonical data model — the Catalog (Product/Variant/OptionType/Taxon/Property/Metafield), Pricing (Price/PriceList), Order graph (Order/LineItem/Adjustment/Shipment/Payment/PaymentSession/Refund/Reimbursement), Inventory (StockLocation/StockItem/StockMovement), Shipping (ShippingMethod/Zone), Promotions, Identity (User/Role/Address/StoreCredit/GiftCard), Taxes, and the v5.4+ Marke

Implement UCP payment handlers — configure Google Pay, Shop Pay, or custom payment methods with tokenization, credential flow, and instrument schemas. Use when integrating payment processing into a UCP checkout.

Customize the Spree v5 Admin Dashboard — Tailwind 4 + Hotwire/Turbo/Stimulus stack, the `Spree.admin.navigation` declarative API (v5.2+) for menu items, partial injection slots (`store_nav_partials`, `store_products_nav_partials`, `store_orders_nav_partials`, `settings_nav_partials`), the Admin SDK components + form builder, custom dashboard reports, the Page Builder for storefront editing, and th

Set up a UCP project — scaffold a merchant server or platform client with discovery profile, SDK installation, and project structure. Use when starting a new UCP implementation.

Implement Spree's checkout — the Order state machine (cart → address → delivery → payment → confirm → complete), the Payment and Shipment sub-state machines, the return flow (ReturnAuthorization → CustomerReturn → Reimbursement → Refund), guest checkout, payment-step skipping for credit-covered orders, and the V3 checkout API surface. Use when building or customizing checkout flows, debugging stat

Cross-cutting Spree development patterns — the customization preference hierarchy (Events > Webhooks > Dependencies > Decorators), `Spree::Dependencies` service-object swapping, the `_decorator.rb` + `prepend` + `self.prepended` idiom, idempotent subscribers and webhook receivers, multi-store scoping discipline, prefixed IDs, calculator polymorphism (shipping/promotion/tax share the base), service

Build with Spree's headless Next.js storefront — the official `spree/storefront` repo (Next.js 16 App Router with Server Actions and Turbopack, React 19 Server Components, Tailwind CSS 4, TypeScript 5, `@spree/sdk`, Sentry), server-only auth (httpOnly JWT cookies + publishable key), MeiliSearch faceted catalog, one-page checkout with Apple/Google Pay/Klarna/Affirm/SEPA, multi-region market routing

Implement MPP server-side middleware for Hono, Express, Next.js, and Elysia. Use when protecting API routes with HTTP 402 payment gates, configuring payment methods, or setting up the Mppx server instance.

Implement MPP session-based streaming payment flows — authorize-once pay-as-you-go patterns for continuous data feeds, per-token billing, and micropayment aggregation. Use when building streaming APIs or services that charge incrementally.

Configure Tempo blockchain as an MPP payment method — USDC stablecoin payments with sub-second finality, 100,000+ TPS, and no gas volatility. Use when setting up crypto-native payment rails for machine payments.

Implement UCP Checkout over the MCP (Model Context Protocol) binding — expose checkout operations as MCP tools for AI agents. Use when building an MCP server that AI agents like Claude or Gemini can call for commerce, or when integrating with Shopify's MCP endpoint.