Installation & Update Manual
Chances are app not working, or you missed certain step , no worries here is the manual.
1. After the installation of the app, go to Shopify admin -> Online store
2. Click on customize.
3. Go to theme settings and click on app embeds
4. You can find an option for a Pfand - deposit fee. Make sure you have enabled the toggle button from the floating widget to use the app.
The update step is same to the installation, just toggle the button off and turn it on, so it fetches new code.
Whenever a new update is available, don't worry a mail will be sent to notify you :)