Session auth (current)
Dashboard and many /api/*.php handlers rely on PHP session cookies after login, sometimes with CSRF protections for business AJAX.
Planned API keys
The draft /api/v1 contract describes X-Tagify-Key and X-Tagify-Secret headers for programmatic access when that surface ships.
Practical advice
Do not embed owner passwords in devices. Use admin-confirmed device pairing for entry hardware and contact Tagify for partner integrations.