We use RapidAPI, which means you have to get an account there and then you can subscribe to our API.
Go to our plan overview page on rapidapi.com and click subscribe. [Go there]
Create a RapidAPI account to be able to subscribe to a CustomJS plan.
Complete the checkout process and get access to your plan
Find and copy your RapidAPI key to use it in Make.com. You can see it here in the center of the page at "X-RapidAPI-Key".
Now create a CustomJS Connection with the API Key you copied before.
Now you can start to execute your custom Javscript code in Make.com