Go to iCheckout -> Dashboard and hit the “Connect GA” button within the Analytics part.
Once the pop-up shows, hit “Authorize” to select the Google Analytics account you want to sync within your analytics dashboard.
Choose your Google account, and the analytics will be synced in a moment.
Note: iCheckout needs this access to connect with your Google Analytics data, update your metrics and data, and show it within your dashboard analytics.
Here is how the iCheckout dashboard will look after you finish all the steps mentioned.
Note: Check this article for more detailed information about the dashboard metrics and what they exactly show.