Using:

Console calculator on Telegram via Bot webHooks API, PHP, SSL https://t.me/calcubot
..or look for @calcubot in telegram

Creating another one. Requirements:

Check php version
php --version
Install curl
sudo apt-get install php7.4-curl
Add domain in etc/hosts:
sudo nano /etc/hosts
127.0.0.1 localhost yourdomain.com
sudo apt install php7.4-mbstring
sudo systemctl restart apache2