Claude Skills by OrcaQubits

Set up a Shopify development environment — Shopify CLI installation, Partner account, development stores, environment variables, project structures for themes, apps, and Hydrogen. Use when starting a new Shopify project.

Test Shopify applications — app testing with Vitest and Playwright, theme testing with Theme Check, Function testing, webhook testing, extension testing, and CI/CD pipelines. Use when writing tests for Shopify projects.

Develop Shopify themes — file structure, Online Store 2.0, sections and blocks, settings schema, Dawn reference theme, Theme Check linting, asset pipeline, and theme deployment. Use when building or customizing Shopify themes.

Implement Shopify webhooks — subscription methods (HTTP, EventBridge, Pub/Sub, SQS), HMAC verification, mandatory GDPR webhooks, delivery methods, retry policy, and idempotency. Use when building event-driven Shopify integrations.

Run and write UCP conformance tests — validate a UCP implementation against the official test suite covering checkout lifecycle, orders, fulfillment, payments, idempotency, webhooks, and security. Use when testing or validating a UCP implementation.

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.

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 theme management. Use when adding admin pages, injecting UI into existing screens, or building admi...

Build with Spree's v3 APIs (v5.4+) — Store API at `/api/v3/store/*` (publishable key + per-user JWT, customer-facing) and Admin API at `/api/v3/admin/*` (per-user API keys + OAuth2 Doorkeeper, admin/operations). Covers the flat-JSON Stripe-like envelope, `?expand=` / `?include=` parameters, prefixed IDs (`prod_…`, `ord_…`), OpenAPI 3.0 spec, rate limiting, idempotency, and migration from v2 JSON:API. Use when building API clients, SDKs, or extending API endpoints in a Spree v5.4+ deployment.

Build and customize Spree's catalog — Products with Variants and OptionTypes/OptionValues, Taxonomies and Taxons (nested set), Properties, Images via ActiveStorage, multi-currency Prices, the v5.3+ PriceList feature for customer/segment overrides, MeiliSearch faceted search (v5.4+), product archiving/activation, CSV import/export, and SEO. Use when modeling products, customizing the catalog UI, indexing search, or importing inventory.

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 state transitions, or wiring custom checkout steps.

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+ Markets + Store multi-region model. Use when designing a feature that touches Spree models, writing de...

Deploy Spree to production — PostgreSQL + Redis + Sidekiq stack, Docker multi-arch images on GHCR, the `spree-starter` Dockerfile + Compose, Heroku/Render/Fly.io/AWS targets, env-var conventions, RAILS_MASTER_KEY, asset precompilation (Tailwind 4 + Propshaft), Action Cable, MeiliSearch indexing, S3 / ActiveStorage for media, log/observability setup, zero-downtime deploys, and migration strategy. Use when going from local dev to production, scaling Spree, or troubleshooting deploys.

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-object composition with `dry-monads` or simple results, why to avoid `class_eval` reopening and ...

Build with Spree's event bus and Webhooks 2.0 — `Spree::Events` publication, `Spree::Subscriber` DSL with `subscribes_to` and `on`, wildcard matching, lifecycle events (`{model}.created/.updated/.deleted` via `publishes_lifecycle_events`), the canonical event catalog (order.*, payment.*, shipment.*, product.*), Webhooks 2.0 endpoints, HMAC-SHA256 signing (`X-Spree-Webhook-Signature`), exponential-backoff retries, and Sidekiq job orchestration. Use when wiring event-driven business logic, buil...

Build Spree extensions as Rails engines — gem scaffolding, `bin/rails g spree:extension`, mounting routes/migrations/assets, the modern `prepend` decorator pattern (`*_decorator.rb` with `self.prepended(base)`), generators (`spree:model_decorator`, `spree:controller_decorator`), the four customization surfaces in preference order (Events > Webhooks > Dependencies > Decorators), Spree::Dependencies for swapping service objects, gem release/versioning, and the deprecated Deface engine. Use when...

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, GA4 + JSON-LD SEO, and Vercel/Docker deployment. Use when forking or customizing the storefront...

Localize a Spree application — the `spree_i18n` gem with 60+ locale packs, the v5.4+ Translations Center for product/CMS content (CSV import/export), Rails i18n basics applied to Spree (translation files, locale switching, pluralization, interpolation), per-Market locale routing in the headless storefront, RTL languages, and translating extensions. Use when localizing a Spree store, adding a new locale, or building i18n-aware extensions.

Work with Spree's legacy v2 APIs — JSON:API-style Storefront API at `/api/v2/storefront/*` and Platform API at `/api/v2/platform/*`, Doorkeeper OAuth2 (password grant for storefront, client_credentials + admin scope for platform), the `spree_legacy_api_v2` gem (required in v5+ for backward compatibility), and migration patterns to API v3. Use when maintaining a v2 client during a migration window, integrating an older partner system, or deciding when to cut over to v3.

Configure Spree for multi-store and multi-region commerce — one Rails install running many `Store` records, the v5.4+ `Market` model (currency + locale + payment methods + shipping per region), what's shared vs per-store (products+inventory+customers shared; orders+payments+themes per-store), the Marketplace module (Enterprise — vendors/commission/payouts via Stripe Connect), and the Multi-tenant SaaS model. Use when planning a multi-brand or multi-region Spree deployment.

Integrate payment gateways with Spree — PaymentMethod model, the v5.4+ PaymentSession provider-agnostic checkout flow, Stripe via `spree_stripe` (Apple/Google Pay, Link, Connect for marketplaces), Adyen via `spree_adyen`, PayPal via `spree_paypal_checkout`, StoreCredit / GiftCard as payment methods, refunds, payment state machine, and authoring a custom gateway. Use when wiring a payment integration, handling webhooks from a gateway, or debugging payment-state issues.

Profile and optimize a Spree application — N+1 queries with bullet/scout, database indexing strategy for Spree's polymorphic associations, Rails fragment + Russian doll caching, ActiveStorage variant pre-generation, Sidekiq queue tuning, MeiliSearch vs Postgres FTS tradeoffs, Puma worker/thread sizing, CDN strategy for catalog pages, asset precompile time, and load testing. Use when Spree is slow, the database is hot, or you're preparing for a traffic spike (Black Friday, launch).

Build and customize Spree's promotions engine — Promotion + PromotionRule + PromotionAction + CouponCode + Adjustment, the bundled rules (FirstOrder/ItemTotal/Product/Taxon/User/OneUsePerUser/Country/CustomerGroup/etc.), bundled actions (CreateAdjustment/CreateItemAdjustments/FreeShipping/CreateLineItems), Calculator classes, coupon batches with CSV export, the v5.1+ advanced rule-based engine, and authoring custom rules/actions/calculators. Use when modeling promotions, building discount UIs...

Secure a Spree deployment — Rails credentials and env-var hygiene, Devise auth (Spree v5 ships it in-core; `spree_auth_devise` is archived), CanCanCan authorization rules, Doorkeeper OAuth2 scopes, Storefront publishable key vs admin API key, webhook HMAC verification, OWASP Top 10 for Rails (mass assignment, CSRF, SQL injection via Ransack, XSS, IDOR through prefixed IDs), PCI scope (Spree never touches raw cards thanks to gateway tokenization), and multi-store data isolation. Use when audit...

Bootstrap a new Spree project — `create-spree-app` CLI (v5.2+), `spree-starter` Rails backend, the Next.js storefront repo, `bin/rails g spree:install`, sample data, Docker Compose, and the PostgreSQL + Redis + Sidekiq prerequisites. Use when starting a new Spree project from scratch or onboarding an existing repo.

Build and customize Spree's shipping and fulfillment — ShippingMethod, ShippingCategory, Zone/ZoneMember, ShippingRate, the Stock::Estimator service, StockLocation/StockItem/StockMovement, multi-shipment orders, ShippingCalculator classes (FlatRate, FlatPercentItemTotal, PerItem, FlexiRate), shipment state machine, returns (ReturnAuthorization → CustomerReturn → Reimbursement → Refund), and integrating carrier APIs (UPS, FedEx, ShipStation). Use when configuring shipping rules, building fulfi...

Test Spree applications and extensions with RSpec — `spree_dev_tools` gem (v5.2+) for factories and helpers, FactoryBot patterns (prefer `build` over `create`), Capybara feature specs, controller/request specs, testing decorators and subscribers, dummy app for extension testing, system specs for the Hotwire admin, and CI patterns. Use when writing Spree tests, setting up CI, or refactoring slow specs.

Build storefronts and integrations using `@spree/sdk` — the official TypeScript SDK for Spree's API v3 (v5.4+). Covers installation, the resource-builder pattern (`spree.products.list`, `spree.checkout.create`, etc.), Zod schema validation, server-only auth (httpOnly JWTs, never exposing API keys), error handling, typing customizations, and pinning SDK versions to backend Spree releases. Use when integrating Spree into a Next.js / Node.js / TypeScript project.

Upgrade a Spree application — version-to-version migration paths (v4 → v5 is a major rewrite; v5.x → v5.y are simpler), Gemfile pinning strategy, decorator brittleness across versions, deprecated gems to remove (`spree_auth_devise`, `deface`, `spree_backend`), API v2 → v3 migration via `spree_legacy_api_v2`, admin Bootstrap → Tailwind transition, the upgrade guide workflow, and rollback strategy. Use when planning a Spree upgrade or auditing technical debt blocking one.

Implement MPP client-side payment handling with mppx.fetch(). Use when building AI agents or automated clients that consume 402-protected APIs, handling the transparent challenge-response payment flow.

Validate MPP implementations against the specification — verify HTTP 402 challenge-response compliance, header formats, payment method correctness, service discovery, and production readiness. Use when auditing an MPP integration or preparing for production launch.

Cross-cutting MPP development patterns — security, replay protection, HMAC challenge binding, receipt validation, error handling, retry logic, TLS requirements, and monitoring. Use when designing architecture or solving production concerns.

Implement MPP payment proxies — wrap existing APIs with HTTP 402 payment gates without modifying the upstream service. Use when monetizing third-party APIs, adding payment layers to existing services, or building API marketplaces.

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.

Scaffold an MPP project — install mppx SDK, configure payment methods, set up server middleware, and create a basic paid API endpoint. Use when starting a new MPP machine payments project from scratch.

Implement Shared Payment Token (SPT) lifecycle management for MPP — creation, usage, deactivation, webhook events, and reconciliation. Use when building the fiat/card payment flow within MPP using Stripe SPTs.

Configure Stripe as an MPP payment method — card and wallet payments via Shared Payment Tokens (SPTs), integrating MPP's HTTP 402 flow with Stripe's payment infrastructure. Use when enabling fiat/card payments for machine-to-machine transactions.

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 AP2 Mandates extension — cryptographic payment mandates for fully autonomous agent commerce using SD-JWT credentials, merchant authorization signatures, and the Agent Payments Protocol. Use when building autonomous agent payment flows without human-in-the-loop.

Implement the UCP Buyer Consent extension — GDPR/CCPA consent collection, consent fields in checkout sessions, and privacy-compliant consent management. Use when adding consent flows, privacy compliance, or data processing agreements to UCP checkout.

Implement UCP Checkout over the A2A (Agent-to-Agent) binding — enable autonomous agent-to-agent commerce using Agent Cards and structured message parts. Use when building agent-to-agent commerce flows.

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.

Run and write UCP conformance tests — validate a UCP implementation against the official test suite covering checkout lifecycle, orders, fulfillment, payments, idempotency, webhooks, and security. Use when testing or validating a UCP implementation.

UCP development patterns — capability negotiation algorithms, idempotency implementation, error resolution loops, multi-binding servers, and production architecture. Use when designing the internal architecture of a UCP implementation or solving cross-cutting concerns.

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.

Implement UCP Embedded Checkout Protocol — iframe/webview-based checkout UI for human escalation using JSON-RPC 2.0 over postMessage. Use when the checkout status is requires_escalation and the buyer needs a merchant-hosted UI.

Implement the UCP Fulfillment extension — shipping and pickup methods, destinations, fulfillment groups, selectable options, and estimated delivery. Use when adding shipping/pickup logic to a UCP checkout.

Implement UCP Identity Linking — OAuth 2.0 authorization code flow for linking buyer accounts between platforms and merchants, enabling personalized checkout experiences. Use when implementing account linking or SSO for UCP.

Implement UCP Order capability and webhook delivery — post-purchase order management with fulfillment tracking, adjustments (refunds/returns), and cryptographically signed webhook notifications. Use when building order management or webhook infrastructure.

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.

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.