Samsung and the Tizen Association recently made the Tizen Software Development Kit for Wearables available from the Tizen developer web site. The SDK supports any wearable running Samsung's Tizen operating system, but that's an extremely limited number of devices at the moment, with just the Samsung Gear 2 and Gear 2 Neo smartwatches filling the space.
A cornerstone feature of any Web application is the login page. This article take you step by step through the process of adding phone number powered second factor authentication (2FA) to a Web application by taking advantage of Nexmo's Verify API. This tutorial requires knowledge of PHP.