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Architecture Overview

The three services

A CarphaCom instance runs three Node.js processes managed by PM2:

  • medusa-backend (port 9000) — Medusa v2 server. All business logic, database access, REST APIs.
  • admin-panel (port 3001, basePath /app) — Next.js 16 admin UI. Talks to the backend via cookie-authenticated proxy routes.
  • nextjs-storefront (port 8000) — Next.js 15 customer-facing storefront. Reads product data via the Medusa store APIs.

A single nginx fronts all three: /app/* → admin, /store/* and /admin/* → backend, everything else → storefront.

Request flow: customer adds to cart

  1. Browser → nextjs-storefront (POST /api/cart/add)
  2. Storefront calls medusa-backend (POST /store/carts/{id}/line-items)
  3. Backend writes to PostgreSQL, returns updated cart JSON.
  4. Storefront returns to browser, triggers cart-drawer revalidation.

Request flow: merchant installs a plugin

  1. Browser → admin-panel (POST /app/api/marketplace/install)
  2. Admin proxy → medusa-backend (POST /admin/plugins/install) with the cookie's medusa_token promoted to Authorization: Bearer.
  3. Backend downloads plugin ZIP from carphacom.com, verifies signature, extracts to /opt/carphacom/installed/<id>/, runs migrations.
  4. Backend writes a row to carphacom_plugin, then pm2 reload medusa-backend.
  5. After reload, the plugin's menu items, providers, and routes are live.

Where to extend

| Goal | Where to add code | |---|---| | New REST endpoint (admin) | medusa-backend/src/api/admin/<name>/route.ts | | New REST endpoint (store) | medusa-backend/src/api/store/<name>/route.ts | | New database table | medusa-backend/src/modules/<module>/models/... + migration | | New scheduled job | medusa-backend/src/jobs/<name>.ts | | New admin page | admin-panel/src/app/(admin)/<route>/page.tsx | | New storefront page | nextjs-storefront/src/app/[countryCode]/(main)/<route>/page.tsx | | Payment provider | Plugin extending AbstractPaymentProvider | | Fulfillment provider | Plugin extending AbstractFulfillmentProviderService |

Federation

The marketplace at carphacom.com is itself a CarphaCom instance with one extra module (marketplace_product). Tenant instances call its public store APIs:

  • GET /store/marketplace/feed — catalog
  • GET /store/marketplace/updates?versions=... — update check
  • GET /store/marketplace/download/<id>/<version> — signed download URL

No customer data ever leaves the tenant instance. Only catalog reads + license verification go to carphacom.com.