This is a simple API Gateway that allows you to configure a Telegram webhook destination in a New Relic Workflow to send alerts to a Telegram channel or group.

You must first create a Telegram Bot and add it to your channel/group as an admin: https://core.telegram.org/bots/tutorial

• Create a Telegram channel or group
• Add @BotFather to the channel/group and make it an admin
• Follow instructions to create a new bot
• Note bot API key

Get chat id for group or channel. Must already have messages in group/channel or this returns empty array:
https://api.telegram.org/bot[BOT_API_KEY]/getUpdates

Send message to bot using chat id:
https://api.telegram.org/bot[BOT_API_KEY]/sendMessage?chat_id=[CHAT_ID]&text=[MESSAGE]

Curl example (Windows) when Express server is running:
curl -H "Content-Type: application/json" -X POST http://localhost:3000 -d "{"telegramBotAPIKey":"[BOT_API_KEY]", "telegramChatID":"[CHAT_ID]", "telegramMessage":"[MESSAGE]"}"