Stuck with registration process

Right Now I want to create user in Auth0 with OTP so I am Following this approach:
first I am calling /start end point for getting otp then i am verfiying that otp with passwordless endpoints then I am creating user in /user endpoint. so how to get token and refresh token what I am getting by react auth0 sdk after login? and I want to restrict the user who has not registered yet we can disable signup but it will also block the password less API’s what i am using to get otp in registration. I am using passwordless login authentication.
I am kinda new in auth0 need help