E-commerce order fulfillment sequence spanning four phases: customer browsing and checkout, payment processing, inventory management, and order tracking. Customer, Admin, Store Staff, Payment System, Order Service, and Inventory Service actors interact across phases to complete the transaction lifecycle. This diagram demonstrates asynchronous handoffs and service boundaries critical for scalable, maintainable e-commerce platforms. Fork this template on Diagrams.so to customize for your payment gateway, inventory backend, or notification service. Use it in architecture reviews to align engineering teams on order state transitions and failure points.