[telegram] Telegram Bot - how to get a group chat id?

create a bot, or if already created set as follows:

has access to messages

apparently, regardless of how old/new the Telegram group is:

1. add a bot to the group

2. remove bot from the group

3. add bot again to the group

4. create a script file and run getUpdates method example:

    var vApiTokenTelegram = "1234567890:???>yg5GeL5PuItAOEhvdcPPELAOCCy3jBo"; // @?????Bot API token
    var vUrlTelegram = "https://api.telegram.org/bot" + vApiTokenTelegram;

    function getUpdates() {
        var response = UrlFetchApp.fetch(vUrlTelegram + "/getUpdates");
        console.log(response.getContentText());
    }

5. function shall log to the console the following:

[20-04-21 00:46:11:130 PDT] {"ok":true,"result":[{"update_id":81329501,
"message":{"message_id":975,"from":{"id":962548471,"is_bot":false,"first_name":"Trajano","last_name":"Roberto","username":"TrajanoRoberto","language_code":"en"},"chat":{"id":-1001202656383,"title":"R\u00e1dioRN - A voz da na\u00e7\u00e3o!","type":"supergroup"},"date":1587454914,"left_chat_participant":{"id":1215098445,"is_bot":true,"first_name":"MediaFlamengoRawBot","username":"MediaFlamengoRawBot"},"left_chat_member":{"id":1215098445,"is_bot":true,"first_name":"MediaFlamengoRawBot","username":"MediaFlamengoRawBot"}}},{"update_id":81329502,
"message":{"message_id":976,"from":{"id":962548471,"is_bot":false,"first_name":"Trajano","last_name":"Roberto","username":"TrajanoRoberto","language_code":"en"},"chat":{"id":-1001202656383,"title":"R\u00e1dioRN - A voz da na\u00e7\u00e3o!","type":"supergroup"},"date":1587454932,"new_chat_participant":{"id":1215098445,"is_bot":true,"first_name":"MediaFlamengoRawBot","username":"MediaFlamengoRawBot"},"new_chat_member":{"id":1215098445,"is_bot":true,"first_name":"MediaFlamengoRawBot","username":"MediaFlamengoRawBot"},"new_chat_members":[{"id":1215098445,"is_bot":true,"first_name":"MediaFlamengoRawBot","username":"MediaFlamengoRawBot"}]}}]}

6. Telegram group chat_id can be extracted from above message "chat":{"id":-1001202656383,"title"