Hello ! sorry for bothering with so many questions...
But in order to make a proper auth procces on my web app, i understand i should pass the device id as customId for a LoginWithCustomID call. And i am not able to get that info using React.
It this moment i am just using a string like "New User" as Custom ID, and login the user when it opens the page, when that user go to Register, i supose to Add a username and password to that account, but that method doesn't allow another user to create another account in the same device. So if i could pass the device id + some string, i could manage more accounts, and also keep silents login saving that customs ids on storage for example.