Revise · W06 · Day 2The Delivery Pipeline: Guarantees, Priorities and Preferences
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Key ideaDay 2 · 1/9
Key the business event
The idempotency key names the event (payments:pay_8812:received), not the HTTP request, and commits with the notification and its outbox row. A retry gets the original id; a reused key with different parameters gets 422.
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