Lifetime: a one-time, non-consumable purchase. Pro stays active on your Apple ID with no further payments.
Monthly: an auto-renewing subscription. New subscribers get a 1-week free trial. Payment is charged to your Apple ID when the trial ends, and the subscription renews each month unless you cancel at least 24 hours before the end of the current period.
You can manage or cancel the subscription in Settings > your name > Subscriptions. Any unused part of a free trial ends when you buy a subscription.
Restore Purchases in the app restores Pro on another device signed in to the same Apple ID.
Use of the app
Bajada is a score keeper. Scores, statistics and badges are for personal use and may contain errors if points are entered incorrectly. Do not use the app as an official record for sanctioned competitions without checking with the organiser.