Pro.
Subscriptions or a one-time purchase, sold by the stores.

01Set it up

1. Create the products in Google Play Console and App Store Connect, with the same ids on both: by default pro_monthly and pro_yearly (subscriptions) and pro_lifetime (non-consumable). You can use other ids; enter them in the console.
2. Choose what is Pro in the console (Features, Model catalog tier).
3. Switch on Pro and paywall > Sell Pro. Set the paywall title and points.
4. Add your terms and privacy links (Legal); both stores require them on a paywall.

02How it works

• Prices always come from the store in the user's currency; there is no price in the code or the config.
• Pro = the lifetime product, or a subscription the store reports as active. At every start (while the paywall is on) the app asks the store what this account owns; a cancelled or refunded subscription the store no longer reports is removed. Offline, the last known state is kept. Restore purchases is also on the paywall.
• Pro is tied to the store account that paid (Google Play or Apple ID), the only identity the app has. There is no server-side receipt check in 2.0.0.
• Purchases are acknowledged with the store (completePurchase), as both stores require.