I’m now at the point in my app where I am designing the in-app billing section, but I can not figure out how to implement it. There will be three subscriptions (monthly, six months, and yearly) and a one-lifetime purchase. Currently, this will only unlock an ad-free experience but in later builds, it will unlock access to other features. What I am having trouble with is understanding how I write the app to understand that they either paid for the lifetime subscript[tion or have an active paid subscription.
If anyone has done this for there own app i would like to know how to store the value for knowing they have an active subscription every time the app opens up
Have you checked this? (This is for onetime purchase only) but a good start.