To check your subscriptions, you must use your Active Campaign account. In order to check them, you need to connect your account first. You can connect your account with your API Key.
You will find your URL and API key in your Active Campaign account > My Settings > Developer.
Insert URL and API Key
You can paste the URL and API Key in YITH > Active Campaign > Integration tab.
After saving changes, you will see the current connection status with the Active Campaign Server.