The Clef API allows developers to integrate Clef's two-factor authentication service into their applications. This authentication service uses no passwords or tokens. Instead, the end user simply holds their smartphone in front of their computer screen to authenticate. Clef also uses Apple's Touch ID technology to identify the user's fingerprints. If the user's device doesn't support Touch ID, a PIN can be substituted, so there's always a second authentication factor.
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The Clef Python Sample Code by Clef demonstrates how to access the API to integrate authentication factors without passwords. It includes a getting started guide to complete the authorization handshake.