By subscribing to Scan Cam, you accept Apple’s Standard End User License Agreement, which governs your subscription. You can read it in full on Apple’s website.
Scan Cam Pro costs €24.99 a year, after a 7-day free trial. The subscription renews automatically at the end of each year unless it is cancelled at least 24 hours before that date. The renewal is billed by Apple to your Apple Account.
Your subscription is managed from your Apple Account settings, on your iPhone: that is where, and only where, it can be cancelled. Scan Cam cannot do it for you. Cancelling before the end of the free trial costs nothing.
Scan Cam is provided as it is, to scan and work on your own documents. You remain responsible for what the documents you scan, edit and share contain, and for the rights attached to them.