Checkout Component Diagram
This component diagram shows an ecommerce checkout as a small set of clear responsibilities. The checkout user interface hands the request to an orchestrator. That coordinator calls separate cart, pricing, payment, inventory and order components, while the order component triggers receipt generation after completion. The drawing is deliberately at component level: it does not describe database tables, API paths or a particular payment provider. It is useful for a design review because it makes the workflow owner and collaboration points visible. Add fraud screening, promotions, tax calculation, inventory reservation or asynchronous notifications when those functions are present in the product.
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Scenario
Ecommerce checkout design
Key decisions
- Workflow coordinator: Gives checkout orchestration one owner.
- Business responsibilities: Separates cart, pricing, payment and inventory concerns.
- Completion output: Connects confirmed orders to receipt generation.
When to reuse this
Use this diagram to explain the major software components in a checkout workflow.
Frequently asked questions
Why use a checkout orchestrator?
Is payment part of the order component?
What does the receipt component do?
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