Refunds are are chargebacks for your purchases. The good thing is that Apple doesn't penalize you for returns, unlike traditional card subscriptions.
On the other side, a user can refund your subscription during almost all paid periods. That's why selling yearly subscriptions can potentially be risky. It's up to Apple about refunds and you can't control it.
Refunds are always followed by a Cancelled Subscriptions.
Apple/Google will let you know about Refunds via server2server notifications. Handle, store and process them to build custom views with Refunds analytics.
Refunds can be viewed in two ways:
Both are useful to analyze.
Adapty does everything for you automatically. Simple install SDK for your platform, open Advanced Dashboard and you're ready to go!