Telegram Bot

• Visit BotFather: https://telegram.me/BotFather
• Create bot by sending message to BotFather

/newbot

• Enable join bot to a group

/setjoingroups

• Add command menu list to bot (command name is lowercase)

/setcommands

• Enable access to all message in group (seletect DISABLE)

/setprivacy

• Add the bot to a group

- Create new group
- Add bot to group
- Set bot as admin
- Set member permission to disable dont send

• Get userid, chat info

- Send message to bot
- Request https://api.telegram.org/botXXX:YYYY/getUpdates
{"ok":true,"result":[{"update_id":xxxxxxxxx,
"message":{"message_id":aaa,"from":{"id":yyyyyyyyy,"is_bot":false,"first_name":"Nhan","last_name":"Cao","username":"nhancv","language_code":"en"},"chat":{"id":zzzzzzzzz,"title”:"XXXXXGroup","type":"group","all_members_are_administrators":true},"date":1567181681,"text":"Test"}}]}

- Look at 
"chat": { "id": zzzzzzzzz, ….
+ chat.id is channel id

"from": { "id": yyyyyyyyy,….
+ from.id is user id

*In case Bot send direct to user chat.id = from.id = userid