If you’ve paid for the monthly (or yearly) Premium on www.camscanner.com, you need to manually pay for that every month (or year) as needed.

If you’ve purchased the monthly (or yearly) Premium via Apple App Store, then the store will automatically charge you the cost next month (or year).

After purchasing, you can check the Premium expire date by entering the app’s “Me” page in the bottom and tapping your account name.