Send a raw payload message to a given user

Raw payloads can be found differently for each separate channel:

One or many raw payloads can be used in the messages array

You can send an image to someone with the following json payload:

{
	"data": {
		"attributes": {
			"messages": [{
				"attachment": {
					"type": "image",
					"payload": {
						"url": "http://placekitten.com/201/202",
						"is_reusable": true
 					}
 				}
			}],
			"recipient": "[email protected]"
		},
		"type": "external-activity"
	}
}
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