The json string from Facebook's post request.

mock_message_location.json

{
	"entry": [
		{
			"id": "entry_id",
			"time": 1485670019761,
			"messaging": [
				{
					"sender": {
						"id": "USER_ID"
					},
					"recipient": {
						"id": "PAGE_ID"
					},
					"timestamp": 1458692752478,
					"message": {
						"mid": "mid.1458696618141:b4ef9d19ec21086067",
						"seq": 51,
						"attachments": [
							{
								"type": "location",
								"payload": {
									"coordinates": {
										"lat": 25.01093,
										"long": 124,39482
									}
								}
							}
						]
					}
				}
			]
		}
	]
}