login using qrcode like whatsup

I don't know whatsup, but I would think it is simple in theory

1. Create a qr code that points to your website with a personal login token (?token=supersecret
2. Add logic to the route that matches the token with a user and logs the user in

My only concern is.. Is it safe? How do they ensure I cannot get your qr code?

Edit : assumed you meant whatsapp. They refresh the qr code on the website every x seconds. Just create a new secret key and update the users table, then show the new qr code

@vandan

Literally @sinnbeck 's solution give you a broad idea of how it works. If you want to create the flow from sketch, his thought will help you to built it.

However, I found a tutorial about it. You can take a look at it. https://www.rolandalla.com/laravel-login-qr-code/