Auth API forum Duo’s Auth API forum is for user discussions about adding two-factor authentication to different services. Find customer questions and content about the Duo Security Auth API. Web SDK Find topics in our Duo Web SDK forum about using the Duo Web SDK to add strong two-factor authentication to your web application. Admin API forum Duo’s Admin API forum discusses the functionality of Duo’s administrative API. Find moderated customer questions and content about the Duo Security Admin API.