A named realtime channel. A backend publishes events to it via the REST
publish endpoint; subscribed SDK clients receive `ChannelEvent` messages.
`PresenceUpdate` messages are emitted as participants join or leave.
An event published to a channel and fanned out to subscribers.
Content-Type: application/json
PresenceUpdate
Emitted when a participant joins or leaves the channel.
Content-Type: application/json
About 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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