This link replays these answers without a new call.
Setup
API key
We call OpenAI's Chat Completions API. Create a key at
platform.openai.com/api-keys
and paste it here. Keys stay in the app's SQLite database on the server—no env files.
How billing works
Sign in to OpenAI.
Create a secret key (starts with sk-).
Ensure your account has billing enabled or sufficient free credits.