Subscriptions and in-app purchases for AVA-Shops on iPhone and iPad are governed by Apple’s Standard Licensed Application End User License Agreement, in addition to the AVA-Shops Terms of Service and Privacy Policy.
You can read Apple’s full Standard EULA on Apple’s website: Apple Standard Licensed Application End User License Agreement.
To manage or cancel an AVA-Shops subscription, open Settings → Apple ID → Subscriptions on your device, or use Manage Subscription in the AVA-Shops app.