Stripe Subscription Fields Are Empty

Hello, I’m integrating Ghost with an email automation tool via Zapier. I have two different flows there - one for paid subscribers and one for free subscribers. Based on whether Stripe Subscription info is present, I add people to one of these flows.

But, Stripe Subscription field is always coming as empty. I can see their payment information in Ghost dashboard, but this information is not getting passed to Zapier.

Need urgent help pls.