So I’m running into the same challenge as @cgrulke did.
The Create Billing Portal Session is supposed to send the user to a Stripe portal page after a form submission - similar to the Checkout Session in the Stripe Subscriptions process.
I tried to follow the same process when setting up the Create Billing Portal Session, but for some reason after submitting the form on my page the redirect does not happen.
I can see the url that I’m supposed to go to in the form’s response, but I’m not automatically taken there like I am for the subscription action.