Where to enter API Key

Hello, I’m new to Katalon Studio and I’m trying to learn how to create and Automate API test.
I’m testing a private API that has a host Url and API Key.
I can’t figure out where to put the API Key in Katalon Studio, I managed to get a response from the server, it says “missing the application key”.
I’ve tried Authorization tab, with Basic type, but I’m not sure what the username can be.