Every PDF API request must be authenticated with your license key, sent as an HTTP header.
Header name and format:
- X-API-KEY: <your license key>
Add this header to every request you make to any endpoint under the base URL api-developers.avanquest.com, including the initial operation request, the status check, and the download call. You can find your key on the Manage License Keys page.
Note: A missing or invalid X-API-KEY header is one of the most common causes of a failed request. If you're getting authentication errors, confirm the header name is spelled exactly as above and that you copied the full key with no extra spaces.