1

Create an integration

In Nango (free signup), go to Integrations -> Configure New Integration -> Fillout (API Key).
2

Authorize Fillout (API Key)

Go to Connections -> Add Test Connection -> Authorize, then enter your Fillout API key. Later, you’ll let your users do the same directly from your app.
3

Call the Fillout API

Let’s make your first request to the Fillout API (fetch a list of all your forms). Replace the placeholders below with your secret key, integration ID, and connection ID:
curl "https://api.nango.dev/proxy/v1/api/forms" \
  -H "Authorization: Bearer <NANGO-SECRET-KEY>" \
  -H "Provider-Config-Key: <INTEGRATION-ID>" \
  -H "Connection-Id: <CONNECTION-ID>" \
Or fetch credentials dynamically via the Node SDK or API.
✅ You’re connected! Check the Logs tab in Nango to inspect requests.
Next step: Embed the auth flow in your app to let your users connect their Fillout accounts.
Questions? Join us in the Slack community.