You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
You can tell when it's free vend on the stations, when you pull up and see the selection for which type of connector on the screen to use, this means free Vend.
If the screen shows the button about using the App, this is paid for.