A message was sent to a channel
{
"type": "message",
"subtype": "pinned_item",
"user": "U123ABC456",
"item_type": "F",
"text": "<@U024BE7LH|cal> pinned their Image <https:...7.png|7.png> to this channel.",
"item": {
…
},
"channel": "C123ABC456",
"ts": "1360782804.083113"
}
The pinned_item message is sent when an item is pinned to a channel.
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