A message was sent to a channel


Works with

	"type": "message",
	"subtype": "group_leave",
	"ts": "1358877455.000010",
	"user": "U2147483828",
	"text": "<@U2147483828|cal> has left the group"

A group_leave message is sent when a member of a private group leaves that group.

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