The "active" Subscriptions API status has been renamed to "running", to reduce confusion upon future release of the backfill subscriptions capability. More details on Subscription Statuses are available here: https://developers.planet.com/docs/subscriptions/#subscription-status
Pagination has now been added to the GET Subscriptions endpoint. You can see a sample response in our API Reference here: https://developers.planet.com/docs/subscriptions/reference/#operation/getSubscription