Yes, you can disconnect your Starling app from your iZettle account at any time. To stop iZettle data being shared with Starling, log into your iZettle account on my.izettle.com, select Integrations, then Connected, and then the Starling Bank integration. Tap  to open it and hit Disconnect.

To remove the iZettle tile from your Starling Marketplace, log into the Starling app and head to the Marketplace section.From there, tap on your iZettle tile and select Remove.