I am trying to implement the Subscription integration and I understand everything but I don't understand how could I implement an update system if someone initially subscribed using the direct card flow. If they use the direct card flow for the subscription, when I use the v1/billing/subscriptions/{subscription_ID}/revise url, it will not come with an approve link thus not allowing that person to change the way they pay going forward. I am trying to figure out whats the best solution to this problem.
