telegram

create a group on telegram
create a telegram bot as outlined below
add only the members who should be notified
after adding the bot to your groups
return to the BotFather and use the /setjoingroups to prevent the bot from joining groups
find your chat id, this will be a little more tedious since the group is private.

Go to telegram with the account that should own your bot
Search for “BotFather” and start a conversation
Enter /newbot
Give your bot a name, for example “ESMS Admin Bot” then press enter
Give your bot a username which must end with bot for example “SCHOOL_ESMS_bot”
Your bot username has to be unique so we suggest prefixing your school name
Do not include any spaces, use only letter, nubmers and the underscore
Copy the information provided by the BotFather. Keep this ecure as this access token allows anyone to control your bot.

Go to the web version of the telgram app and log in
Open the group in the web and look at the url
The url should look like this https://web.telegram.org/z/#CHAT-ID
CHAT-ID is a number which may begin with a minus sign
the url may also take the form https://web.telegram.org/#/im?p=cCHAT-ID_2674311763110923980
Copy the CHAT-ID
Your chat is a private channel, then you will need to put “100” after the “-” and before teh other digits

Telegram