Detecting consumed trial period

[StefanWallin]

I saw this issue (#81) and the resulting PR that mentions that this library has nothing to do with Free Trials. App Store guidelines require that we communicate clearly about price and such things and would like to do this on our paywall. Is there any way to detect whether or not a trial period has been consumed, or can we check the price on the loaded products somehow? A subscription with a trial period should maybe have two prices? Or maybe even a date range for prices? Do you know of any of this? Could not find info about it in the readme.