API guides
Authenticate API requests
Use a bearer API token securely in server-to-server requests.
Reviewed 2026-08-05 · PDFDesignAPI Engineering
Bearer token
Send the API token in the Authorization header for every public v1 request.
Store tokens in a secrets manager or protected environment variable and rotate them if exposed.
Authorization: Bearer API_TOKENRequest security
Use HTTPS and call the API from trusted backend code.
Do not include tokens in URLs, logs, analytics events, client bundles, or support screenshots.