403 "API access is disabled for this company" — is the API available on a Mettle-provided (free) FreeAgent subscription?

Authentication
1

What I’m trying to do:
Connect my own FreeAgent company to a third-party app I’ve built (OAuth), to create invoices.

What’s happening:
OAuth completes successfully against production — I receive valid access and refresh tokens. But every authenticated call, including the simplest read, returns a 403.

Exact request:

GET https://api.freeagent.com/v2/company

Authorization: Bearer <valid production token>

User-Agent: <my app name>

Accept: application/json

Exact response:

HTTP 403

{"errors":{"error":{"message":"API access is disabled for this company"}}}

What I’ve established:

  • It’s a 403, not a 401 — the token is valid and accepted; the company itself is gated.
  • Same result on GET /v2/company, so it’s not a payload or scope issue.
  • The app authorised fine and tokens refresh correctly.
  • My FreeAgent subscription is the free one provided through Mettle, not a direct paid subscription. The account is active.

My questions:

  1. What causes “API access is disabled for this company,” and can I resolve it myself?
  2. Is the REST API available on a Mettle-provided free FreeAgent subscription, or does it require a paid plan? This is the key thing I need confirmed.
  3. If it can be enabled, what’s the exact step — a company-side flag, a setup stage, or an upgrade?

Thanks!