A message was sent to a channel
{
"type": "message",
"subtype": "channel_archive",
"ts": "1361482916.000003",
"text": "<U1234|@cal> archived the channel",
"user": "U1234"
}
A channel_archive message is sent when a channel is archived.
When an event occurs, we will send an HTTP POST request to your Request URL. The outer payload is uniform across all Events API methods, and contains fields like team_id and event. Learn more