I am building token auth system in Craft 3. https://docs.craftcms.com/v3/dev/examples/login-form.html I used this Login Form.
Now I am going to create my own token and save it in user profile.
First problem is to link this Form Submit Action to my custom action. I can not find the controller linked to this action.
How can I customize my login system? Where can I find the controller for the built-in login form logic?