BDK In-App Purchases Help

Hey so I’ve gone with the BDK conversion. I need some help with setting up in app purchases. I have put the BN-appinfo and BN-appIOS elements on my page and set the workflow up to “in app purchases iOS” when the user clicks subscribe. How to confirm the subscription has happened and get the information into my database?
Also I need to know how to check the user has an active subscription to make sure they haven’t cancelled when the log in.

Any help would be dearly appreciated.

Trying to bump this up due to how desperate I am