以GroupID=202061134174478為例子
***一定要是admin才能發文

0.『上線』前需要申請權限
應用程式權限:【groups-api】、【publish_to_groups】、【groups_access_member_info】
Messenger權限:【page_messaging】
延長權杖:https://developers.facebook.com/tools/debug/accesstoken/


1.PO文與讀取內容

1.1在社團發佈一則貼文"I love this Group"，再結尾會出現OO(由應用程式發布)
	
	1.1.0【需要publish_to_groups權限，才能用應用程式發布訊息】，【admin】
	1.1.1.Request:取得
	https://developers.facebook.com/tools/explorer/?method=POST&path=202061134174478%2Ffeed&version=v7.0&message=I%20love%20this%20Group
	1.1.2.Response:PO回覆的ID(GroupID-POSTID)，
	{  "id": "620899171850629_622045855069294" }
	
	==>>  {  "id": "{GroupID}_{POSTID}" } 
	==>>  永久網址 https://www.facebook.com/groups/620899171850629/permalink/621318175142062/
	==>>  可以透過1.2取得留言內容

1.2取得貼文內容

	1.2.0【需要groups_access_member_info權限，才能顯示ID】，【user】【admin】
	1.2.1 Request:取得
	https://developers.facebook.com/tools/explorer/?method=GET&path=202061134174478_205484600498798%3Ffields%3Dcomments&version=v7.0
	1.2.2.Response:from這個是facebook登入顯示的id、name
	{
	"comments": {
		"data": [
		{
			"created_time": "2020-06-10T08:58:24+0000",
			"from": {
			"name": "Yh Liu",
			"id": "569972750560974"
			},
			"message": "love +1",
			"id": "205485577165367"
		}
		],
		"paging": {
		"cursors": {
			"before": "WTI5dGJXVnVkRjlqZAFhKemIzSTZANakExTkRnMU5UYzNNVFkxTXpZAM09qRTFPVEUzTnprMU1EUT0ZD",
			"after": "WTI5dGJXVnVkRjlqZAFhKemIzSTZANakExTkRnMU5UYzNNVFkxTXpZAM09qRTFPVEUzTnprMU1EUT0ZD"
		}
		}
	},
	"id": "202061134174478_205484600498798"
	}


2.Messenger JS SDK:
https://developers.facebook.com/docs/messenger-platform/discovery/send-to-messenger-plugin?locale=zh_TW

3.點選send to messenger就可以取得psid