Is Zoho Workdrive API locked behind a paywall?

We're using the paid version of Zoho to gain access to some more apps, but only the Free Essentials Plan in Zoho WorkDrive. Does this enable us to use some API requests, or do we have to pay for the storage as well?

I tried some simple scripts, like for example trying to see general info

responseUrl = "https://www.zohoapis.eu/workdrive/api/v1/files";

response = invokeurl

[

url : responseUrl

type :GET

connection:"test_connection"

];

info response;

Or trying to see info on files using the folder ID. And looks like the url and connection are correct (otherwise there would be errors thrown), but the response is simply empty - nothing is there. Hence my question.