payments/hpp-status-update
Hosted Payment Page session status callback. Configured as `merchant_urls.status_update` on the HPP session. Klarna POSTs an `event_id` plus the current `session` object whenever the HPP session transitions state.
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application/jsonAbout AsyncAPI
The AsyncAPI specification describes event-driven APIs the way OpenAPI describes request/response APIs. A channel is the named pipe — a webhook URL, a Kafka topic, a WebSocket route, an MQTT subject — that producers and consumers publish or subscribe to. Each channel carries one or more messages with structured payloads, and an operation declares whether a given party sends or receives on that channel.
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