Explore Alexandria · Optio Alexandria

Data Command Query Event In-process Scroll or drag to pan · Ctrl + scroll or pinch to zoom

Notes

Explore Alexandria 1 of 6

Illustrative payment system · authored sample knowledge

Follow the payment use case through the real project views. Select a step, a part or its supporting context.

Connect a business outcome to the parts responsible for it.

Check the existing operation · Payment service → Fictional processor · Query · Network · Fictional processor operations A bounded, on-demand read asks the fictional processor about the existing operation. An unanswered lookup leaves the outcome unknown; it does not start another payment.
Submit the same payment operation · Payment service → Fictional processor · Command · Network · Fictional processor operations The payment service calls the fictional processor with pay-op-1001 and identical parameters inside the authored 24-hour retry window.
Submit the same refund operation · Payment service → Fictional processor · Command · Network · Fictional processor operations The payment service submits refund-op-1001 with identical refund parameters. A retry of that logical refund retains the key inside the fictional contract window.