Card List is a loyalty card wallet. It does not collect, store, or share any personal data.
The cards you add are stored on your device. If iCloud is turned on, they are synced to your devices through your own private iCloud account, managed by Apple. The developer cannot see or access them.
Delete a card in the app, or delete the app to remove everything on the device. Cards synced to iCloud can be removed in Settings › [your name] › iCloud.
Email: minho42+cardlist@gmail.com