Systems map
The system-level view of Acme Inc's commerce platform and the responsibilities of each major system.
Systems group services and data stores around a stable business capability. They are the best unit for understanding runtime ownership, operational dashboards and integration boundaries.
Checkout and payment maps
The checkout and payment systems are the highest-coupling parts of the platform. Use these maps when assessing checkout changes, payment incident impact or ownership questions across Ordering and Payments.
Internal systems
| System | Domain | Role |
|---|---|---|
| Product Catalog SystemProduct Catalog SystemSystemv1.0.0Internal system that is the source of truth for product data. Owns the product database and publishes product change eve...Ownerproduct-platformMapView docs | CatalogCatalogDomainv1.0.0The Catalog domain owns everything about products — how they are created, maintained and made discoverable across Acme I...Ownerproduct-platformMapView docs | Source of truth for product data and product change events. |
| Search SystemSearch SystemSystemv1.0.0Internal system that keeps product data searchable. Consumes product change events from the Product Catalog System, main...Ownersearch-platformMapView docs | CatalogCatalogDomainv1.0.0The Catalog domain owns everything about products — how they are created, maintained and made discoverable across Acme I...Ownerproduct-platformMapView docs | Maintains a search index and serves product search queries. |
| Cart SystemCart SystemSystemv1.0.0Internal system that owns the customer's shopping cart and the checkout flow. It is the source of truth for cart content...Ownershopping-platformMapView docs | ShoppingShoppingDomainv1.0.0The Shopping domain owns the customer's path to purchase — building a cart, applying promotions, and checking out. It co...Ownershopping-platformMapView docs | Owns carts and emits checkout intent. |
| Promotion SystemPromotion SystemSystemv1.0.0Internal system that calculates the discounts and promotions that apply to a cart. It owns promotion rules and returns c...Ownershopping-platformMapView docs | ShoppingShoppingDomainv1.0.0The Shopping domain owns the customer's path to purchase — building a cart, applying promotions, and checking out. It co...Ownershopping-platformMapView docs | Calculates discounts for carts. |
| Checkout SystemCheckout SystemSystemv1.0.0Internal system that orchestrates checkout. When a cart is checked out it reserves inventory, authorizes payment, and as...Ownerordering-platformMapView docs | OrderingOrderingDomainv1.0.0The Ordering domain turns a checked-out cart into a confirmed order. It orchestrates checkout — reserving inventory, aut...Ownerordering-platformMapView docs | Coordinates checkout as a saga. |
| Order Management SystemOrder Management SystemSystemv1.0.0Internal system that is the source of truth for orders. It creates orders, tracks their lifecycle, and publishes events ...Ownerordering-platformMapView docs | OrderingOrderingDomainv1.0.0The Ordering domain turns a checked-out cart into a confirmed order. It orchestrates checkout — reserving inventory, aut...Ownerordering-platformMapView docs | Owns order state and order lifecycle events. |
| Payment Processing SystemPayment Processing SystemSystemv1.0.0Internal system that orchestrates payment for orders. It authorizes payments, requests charges from the external payment...Ownerpayments-platformMapView docs | PaymentsPaymentsDomainv1.0.0The Payments domain takes payment for orders and processes refunds. It orchestrates authorization and capture through an...Ownerpayments-platformMapView docs | Records payment intent and drives payment/refund processing. |
| Inventory SystemInventory SystemSystemv1.0.0Internal system that tracks stock and reserves it for orders. It is the source of truth for available inventory and conf...Ownerfulfilment-platformMapView docs | FulfilmentFulfilmentDomainv1.0.0The Fulfilment domain gets a confirmed order to the customer. It reserves stock, picks and packs orders in the warehouse...Ownerfulfilment-platformMapView docs | Owns stock and reservations. |
| Warehouse SystemWarehouse SystemSystemv1.0.0Internal system that picks and packs orders in the warehouse. It reacts to completed orders, organises picking, and sign...Ownerfulfilment-platformMapView docs | FulfilmentFulfilmentDomainv1.0.0The Fulfilment domain gets a confirmed order to the customer. It reserves stock, picks and packs orders in the warehouse...Ownerfulfilment-platformMapView docs | Picks and packs completed orders. |
| Shipping SystemShipping SystemSystemv1.0.0Internal system that hands packed orders to carriers. It reacts to ready-for-shipping orders and creates shipments with ...Ownerfulfilment-platformMapView docs | FulfilmentFulfilmentDomainv1.0.0The Fulfilment domain gets a confirmed order to the customer. It reserves stock, picks and packs orders in the warehouse...Ownerfulfilment-platformMapView docs | Creates shipments and tracks delivery handoff. |
| Customer Management SystemCustomer Management SystemSystemv1.0.0Internal system that is the source of truth for customer profile data. Owns the customer database and publishes customer...Ownercustomer-platformMapView docs | CustomerCustomerDomainv1.0.0The Customer domain owns who our customers are — how they register, how their profile is maintained, and how they are au...Ownercustomer-platformMapView docs | Owns customer profile data. |
| Identity ProviderIdentity ProviderSystemv1.0.0The identity system that authenticates customers. It is the source of truth for credentials and login, verifies sign-in ...Ownercustomer-platformMapView docs | CustomerCustomerDomainv1.0.0The Customer domain owns who our customers are — how they register, how their profile is maintained, and how they are au...Ownercustomer-platformMapView docs | Authenticates customers and manages user credentials. |
External systems
The catalog also documents external dependencies:
- StripeStripeSystemv1.0.0External payment processor used by Acme Inc to charge cards and issue refunds. It receives payment and refund requests a...Ownerpayments-platformMapView docs processes charges and refunds.
- Fraud DetectionFraud DetectionSystemv1.0.0External provider that screens payments for fraud. It consumes payment requests and returns a pass or fail verdict. Ownerpayments-platformMapView docs screens payments.
- CarrierCarrierSystemv1.0.0External carrier that delivers shipments to customers. It accepts shipment requests and reports delivery progress back. Ownerfulfilment-platformMapView docs creates and tracks shipments.
Why systems matter
Services can change implementation technology, but system responsibilities should stay stable. For example, Payment APIPayment APIServicev1.0.0
Receives payment authorization requests from the Ordering domain and records the payment intent, kicking off the charge ...Subscribesauthorize-paymentOwnerpayments-platformMapRepoView docs and Payment WorkerPayment WorkerServicev1.0.0
Drives charges and refunds against the external payment processor and records the outcomes. It requests payments and ref...Publishespayment-requested, refund-requestedSubscribespayment-succeeded, payment-failedOwnerpayments-platformMapRepoView docs can evolve independently, but both remain inside Payment Processing SystemPayment Processing SystemSystemv1.0.0Internal system that orchestrates payment for orders. It authorizes payments, requests charges from the external payment...Ownerpayments-platformMapView docs and share the same payment data ownership boundary.
Use system pages for impact analysis when a change affects multiple services or a shared data store.