val originalPurchaseDate: Date?
the purchase date for the version of the application when the user bought the app. Use this for grandfathering users when migrating to subscriptions. This can be null, see -Purchases.restorePurchases
originalPurchaseDate - the purchase date for the version of the application when the user bought the app.
Use this for grandfathering users when migrating to subscriptions. This can be null, see -Purchases.restorePurchases