Register using Telegram bot in Laravel

I try to create registration system with telegram bot in laravel 5.4 , first I install telegram-bot-sdk on my project then I set webhook and everything works nice, but when I want to grab data from users I don't know how should do it ? Because I can only access to last users updates and I cannot detect which message containt to which user ?

These are my problems and I want to know first how can I grab information from different users.

via Chebli Mohamed