​To show all past due subscriptions:

1. ​Go to your subscriptions page in the admin under PRODUCT. Here's a link: https://admin.foxycart.com/admin.php?ThisAction=ManageProductSubscriptions
2. Click the “add filter:” dropdown list.
3. Select “Past Due Amount:”. The following will appear: [ - ] past due amount: …is greater than 0
4. Click “Filter”.
5. Scroll down to see past due only subscriptions.