Whether you're wiring up an integration, connecting an AI assistant or answering a question from support, the first hurdle is usually the same: which identifier, and where does it live? Here is the whole map.
One distinction does most of the work: an ID is an address — it says which books or which person, and it's safe to share. A key is a password — it opens your books, and it's never safe to share.
- API key — Settings → Business → Advanced
- Business ID — Settings → Business → Advanced
- Profile ID (your account ID) — Profile page
- MCP server address — Settings → AI
- App ID (apps you registered) — Settings → API → open the app
Find your Business ID
Copy it from Settings → Business, under the Advanced heading.
It identifies this specific set of books. If you run more than one business, each has its own — switch business first, then copy.
Find your API key
Same place, just below. See Get your API key.
Find an app's App ID
Only if you've registered an app: open it from Settings → API, under Administration — the App ID is inside, alongside the install link and the app's own keys.
Find your Profile ID
Copy the Profile ID field on your Profile page, just below your password. This is your account ID — it identifies you as a person, across every business you belong to. Your Business ID identifies a set of books; your Profile ID identifies you.
Find your MCP server address
Copy the MCP server field at Settings → AI. See Set up MCP.
Tip: Support will sometimes ask for your Business ID when investigating something. It identifies your books without exposing anything sensitive — unlike your API key, which you should never send to anyone.