Single subscriber endpoint that receives every Dropbox Sign account
callback. The `event.event_type` field on the JSON body identifies the
event class. One event is sent per HTTP POST.
Account-scoped event delivered to the account callback URL. The
`event.event_type` discriminator carries the specific event name.
Content-Type: multipart/form-data
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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