How to apply conditional routing in Angular where the condition is to make sure that the previous page has been visited?

I have an Angular web app where to sign up you go through different pages:

  1. Fill in your name and email
  2. Fill in your password
  3. Fill in your confirmation code

Hence the URL changes from website.com/intake to website.com/intake/signup to website.com/intake/confirmation.

My problem is that it is currently possible for a user to change the url from website.com/intake to website.com/intake/signup and finish the registration without filling the other information. I would like to prevent that but I am not sure how to use routing in this case.

I want to make sure that the user can go to the next page only if he has been to the first one and has filled in. Now I know, if I make the form fields * required it will not allow the user to go further but he will still be able to bypass that by changing the url.

How do I solve that?