How can I use Open AI with HelpNDoc 9.2?

HelpNDoc 9.2 now supports OpenAI and we had to input a authorization token. I assume this is the same as a project secret key?

Anyway, I used this secret key and when I try using HelpNDoc AI Assistant it tells me that I have no credits. Why? I understood that ChatGPT 3.5 is free?

ChatGPT may be free. But ChatGPT is also a name for only the web site chatbot.

The API is billed by usage. Credits must be prepaid. The payment interface is on platform.openai.com, behind settings → billing overview.