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.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.