Find Your Active Subscribers
If you have a subscription product and need to know who is still paying for subscriptions, the best way to find out is through your Customers tab, and downloading a CSV of your customers.
First filter your subscription product, then export your customers to a CSV file. Set the date range for your product to go to the date you published the product.
On your CSV, you can scroll over to Column S("Recurring Charge") to find the customers who have cancelled their subscriptions, marked by a big fat FALSE.