It enables multiple database connections on user registration.

AuthController.php

    /**
     * Create a new user instance after a valid registration.
     *
     * @param  array  $data
     * @return User
     */
    protected function create($connection, array $data)
    {
        $user = new User();

        $user->setConnection($connection);

        $user->fill([
            'name' => $data['name'],
            'email' => $data['email'],
            'password' => bcrypt($data['password']),
        ]); 

        $user->save();

        return $user;
    }