You can manage your subscription via the 'Payment Support' page accessible by clicking the top-right menu from within the app
No they are not, for your privacy we do not collect information about you and do not have an account system. Your projects are stored locally on your devices (in the app's data folder). In the future we may offer a system to back these up manually or even to sync them to your iCloud of Google Drive account.
This app (Pop Snap) has been lovingly created by Rocketware Limited, a very small and very friendly business based in Leeds, United Kingdom. The app has been designed and built by Jimmy - the company founder.
You can find my contact information on the app store listings.