SMS notification delivery channel. When a message is published to a topic with SMS subscribers or directly to a phone number, SNS delivers the message as a text message. The SMS message contains only the published message text, truncated to fit SMS size limits.
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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