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Microservices order saga — Sequence Diagram

A distributed order-processing saga showing the parts of UML sequence notation that generic tools omit — a ref interaction-use frame, a par fragment for concurrent service calls, asynchronous event-bus messages, and an alt fragment with a compensating rollback on payment failure.

Type UML sequence diagramStandard OMG UML 2.5.1 §17 (Interactions)Engine schematex-sequenceUpdated 5/26/2026
Microservices order saga
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The request

“Create an order-processing saga where an API gateway calls an order service, payment and inventory run in parallel, and a failed payment releases inventory and cancels the order.”

Then tryAdd an email confirmation after a successful order.Add a retry for an inventory timeout.
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