Does exactly what it says it does
The app does what it says it does, and is very simplistically designed. The only bug I’ve found so far is that when you purchase the Pro Upgrade, the button to purchase the Pro Upgrade does not disable or go away, allowing the user to repeatedly initiate the purchase process (trigger Apple Wallet). I haven’t tested whether it would actually allow a second transaction on the Apple side, but I would expect so. The developer needs to fix this flaw to prevent accidental user double-billing.