Microsoft Teams webhook. Modern connections use a Microsoft Workflows
URL and post an Adaptive Card (`type: message` with an
`application/vnd.microsoft.card.adaptive` attachment). Legacy Microsoft
Connector endpoints accept `MessageCard` payloads but are on
Microsoft's deprecation path.
Microsoft Teams MessageCard payload (legacy Connectors)
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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