Where EventBridge delivers AWS Marketplace lifecycle notifications — upgrades, renewals and cancellations. The only channel through which a purchase can change after onboarding. Kept to authenticate, capture, publish, acknowledge. An API destination gives up on a slow endpoint and counts it as a delivery failure, so the licence read, the entitlement re-read and the client update all happen on the bus instead. Only the fields EventBridge guarantees are read here; the marketplace identifiers inside "detail" are parsed by the consumer, against the body persisted alongside them.