The HelloSign 2-Factor Auth Twilio PHP Sample Code demonstrates how to use PHP language to authenticate with key and with a signature. The API uses Twilio and a secret number, confirming username, email, and pin.
A summary of discussions from OKFestival on open data business models reveals a strong commitment to fostering an ecosystem, while many startups commence with a composite model with multiple revenue streams.
Locu, one of CNN's hot startups to watch, has released an API that exposes Locu's database of business information to third party developers. Locu launched the Locu API at Tech Disrupt SF 2012 and drew immediate attention. The API allows developers to retrieve real-time business data (e.g. venue information, pricelists, menus, etc.) and integrate the data into existing applications. Locu's index crawls the web for business data, and the API makes that data available to other websites and applications.