API Key Security
API Keys grant access to the system via the API with the same permissions as the user that they were created for.
As such they should be treated like passwords and kept secure at all times.
If you believe an API Key to be compromised immediately disable it with the Interu application.
Hover over the API Key entry that you wish to disable and you will see an edit icon appear:

Click on that icon and it will open a new window
On the API Key Details window there is an Enabled field:

Click on the green tick, click on Save and the API Key will no longer be active.