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1. Get an API key

Sign up at auo.com.au/app/signup, then create a key from the dashboard. You get two prefixes:
  • auo_sk_test_... returns synthetic sandbox fixtures. Free, safe to experiment with.
  • auo_sk_live_... returns real government data. Same code path, real results.
See Authentication for the details.
Your key is shown once, at creation. Store it securely. There is no “view key”, only “roll” (regenerate). Never put a key in a URL or commit it to source control.

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2. Make your first call

Resolve the Australian Taxation Office by its ABN. Pass your key as a bearer token. 
curl https://api.auo.com.au/v1/resolve \
  -H "Authorization: Bearer auo_sk_test_your_key_here" \
  -H "Content-Type: application/json" \
  -d '{"abn": "51824753556"}'

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3. Read the response

Every field carries its source and, where the source dates it, an as_of timestamp. That is the provenance you can hand to a compliance reviewer.
Response
{
  "query": { "abn": "51824753556" },
  "candidates": [
    {
      "match_confidence": 100,
      "match_signals": { "exact_identifier": "abn" },
      "canonical": {
        "entity_name": {
          "value": "AUSTRALIAN TAXATION OFFICE",
          "source": "ABR",
          "as_of": "2026-07-02T13:22:15+10:00"
        },
        "abn": { "value": "51824753556", "source": "ABR" },
        "acn": {
          "value": null,
          "source": "ABR",
          "note": "trusts/sole traders/partnerships have no ACN; companies only"
        },
        "entity_form": { "value": "other", "source": "ABR" },
        "abn_status": { "value": "Active", "source": "ABR" },
        "gst_registered": { "value": true, "source": "ABR" }
      },
      "charity": { "is_registered_charity": false },
      "licensing": { "afs_licensee": null, "credit_licensee": null },
      "screening": {
        "dfat_sanctions": { "status": "no_match" },
        "asic_banned_org": { "status": "no_match" }
      }
    }
  ],
  "disclaimer": "Verification and enrichment layer. Does NOT include directors, shareholders, or beneficial ownership; these are not available in Australian free public sources."
}
A name that ABR does not recognise returns a clean 200 with an empty candidates array, not an error. Only an identity-source outage returns a 502.

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Next steps

Resolve by name

Pass name instead of an identifier for a ranked, fuzzy match.

Screen an entity

Check a name against sanctions and banned-persons registers.

Watch for changes

Get a signed webhook when a monitored entity changes.

The entity model

Why an ACN is not just an ABN, and how trusts resolve to a trustee.