How to get permanent API Key

How to get permanent API Key

Hi, I've read over the API OAuth documentation (https://www.zoho.com/accounts/protocol/oauth/ and https://www.zoho.com/creator/help/api/v2/openapi-specification.html) and see that there's a way to generate client id, client secret, and code here: https://api-console.zoho.com/ to request an access token to access the API.

This works fine for OAuth flows in the browser and if you want temporary API access, but how do I get a permanent API key that I can generate one time and use forever for my server side application?

It seems like the code generation via the API console expires in 10 minutes, and the access tokens expire in 60 minutes. I need a long running API key that I can request once and not have it expire. How do I achieve this with the Zoho Creator API?