curl -X POST https://api.telegram.org/bot<YOUR-BOT-TOKEN>/setWebhook -H "Content-type: application/json" -d '{"url": "https://your-ngrok-subdomain.ngrok.io/api/webhook"}'
TELEGRAM_BOT_TOKEN=<YOUR-BOT-TOKEN> vercel dev
Reference: https://www.marclittlemore.com/serverless-telegram-chatbot-vercel/