We're in the process of implementing in-app purchases and I'm curious if someone can provide more detail on how Apple defines an "Upgrade" vs. a "Downgrade" when a user makes a change to their subscription. An Upgrade goes into effect immediately, but a Downgrade goes into effect at the next renewal.
So is an Upgrade if the user changes to a longer duration of a subscription plan and Downgrade is if a user changes to a shorter duration of a subscription plan?