Has anyone managed to do in-app subscription upgrade/cancellation?
My app has multiple types of subscription (lite monthly, premium monthly, premium yearly) and I like to allow my users to switch between subscription without being double charged.
The default corona plugin for IAP for google doesn't seem to have these function (plugin.google.iap.v3 / store)
Google API does have support for these functions https://developers.google.com/android-publisher/api-ref/purchases/subscriptions/cancel
while iOS doesn't seem to offer anything similar, but force user to use the subscription manager instead.
Any advice for good practice on in-app subscriptions would be welcome. Thank you.