Ready to See uses Apple's Standard End User License Agreement (EULA).
You can review it here:
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Subscriptions
If you choose to purchase Ready to See Premium:
- Payment is charged to your Apple ID at confirmation
- Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period
- You can manage or cancel your subscription in App Store account settings
Apple manages all billing and refunds.