To uninstall the app follow the steps in the Uninstall an app section from Shopify here: https://help.shopify.com/en/manual/apps/uninstalling-apps#uninstall-app.
Uninstalling the app will remove any additional future charges. Important Note: Charges are not prorated. If you'd like to remove your charging but keep using the app until your monthly billing cycle ends, please contact support at: [email protected]