The Withings PHP library by Alexander Liljengård was written with the purpose to adapt to the body metrics' functionalities of the API. It works with OAuth1 to get measures of activity, body, intraday, and sleep. For more information about authorization, parameters, and reference, visit http://oauth.withings.com/api
Dexcom, a continuous glucose monitoring solution provider, has launched an API that grants access to continuous glucose monitoring data. Use of such data is completely at the discretion of the user, on an app by app basis. The goal is to give users options to interact with glucose data.