User Profile

Dear all, This is my first post in this forum - and, in fact, my first app, too! I'm glad to be here, and thanks in advance for your help. I'm looking to offer an app for a one-time payment. I'd also like people to be able to try the app for a week. It seems that the "Pricing and Availability" section in App Store Connect is not the right place to configure this kind of offer. It does allow me to set a one-time price, but I cannot find a trial-period there (or am I missing something?) Two different strategies seem possible here: Using in-app-purchases: make the actual app free, but ask users after a week to buy a non-consumable IAP. The problem with that: I need to verify that the app has been installed for seven days ... even if it has been uninstalled at some point. Using subscriptions: There is a "free trial" option for subscriptions. But after that free trial, subscriptions are being payed periodically. I'd rather have the user only pay once for lifetime-access. Some apps seem to use strategy 1 - I believe the "Lap swim" app does. But still it seems like a bit of a hack - is there a more elegant way to achieve this?