StoreKit 1 Subscriptions

In StoreKit 1 and Objective-C, how do I obtain currently active subscriptions? I'm trying to obtain this information:

  • The currently active (i.e. valid and not refunded) subscription in a subscription group
  • A "pending" subscription, if any (when changing subscription types mid-period), and its starting date

Sadly, all StoreKit 1 documents are buried deep under StoreKit 2 docs. Using StoreKit 2 is not an option.