I am using auth0 universal box with my next.js static website. What i am trying to achieve is Integration of Stripe checkout after user signup. As per viewing the documentation i have successfully customized the login flow by adding two custom actions Link user to stripe and add stripe Id to access token. It is super awesome to see that kind of communication between stripe and auth0. My question is can i add a stripe pricing table in flow. I mean i want when user signs up after registeration before the main page user will be redirected to checkout page where user will pay and after that user will be redirected to Homepage. How to achieve this ( keep in mind i am using universal box ). Is there anyway adding a custom action in flow to add a Javascript page ?