Authorization and registration Laravel?

Question

Laravel

Help! There are websites, there are also mobs. applications. There is also a service for registration and authorization of users. It turns out if someone registers with one account. Can log in to all 3 sites and mob. applications. And so the service for authorizations did, returns a token. And the question is how to do all this in Laravel itself, to override custom authentication? and I can't figure out where it's safer to store the token?. If anyone has done something like this please let me know how. thanks in advance