A message was sent to a channel

Facts

Works with

RTMEvents API
{
	"type": "message",
	"subtype": "group_purpose",
	"ts": "1358877455.000010",
	"user": "U2147483828",
	"purpose": "whatever",
	"text": "<@U2147483828|cal> set the group purpose: whatever"
}

A group_purpose message is sent when the purpose for a private group is changed using the group.setPurpose method.

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