This TextKey PHP library allows a developer to implement REST API calls server-side from a PHP backend. TextKey is an omni-factor authentication API that uses seven-factors of authentication to provide security for devices ranging from mobile to electronic door locks. TextKey works through using SMS service, unique code, cellular number, UDID, a single use URL, and an optional pin. TextKey uses REST with a JSON response and SOAP. TextKey is free for ten users, and available for a monthly charge per user thereafter.
Canadian based startup LoginRadius is a Software As A Service (SAAS) provider of social infrastructure (Social Login and Social Sharing) that is currently used by over 25,000 websites. Despite being a fairly new service (The company was founded in May 2011), LoginRadius has expanded rapidly, partly in thanks to the LoginRadius API.
Security is of paramount importance in applications. APIs are the cornerstone of most applications today and ensuring that the data flowing through the API calls is secure cannot be overemphasized. Secure Sockets Layer (SSL) has been available to us for years now and Google has made the first moves in using SSL across its suite of products with a plan to rolling out SSL for most of its developer APIs in the latter part of the year.