The Fitbit Connector Plug-in provides a function called getFitbitInfoForDay() that allows you to retrieve fitness details and user profile details from your Fitbit account. This includes profile details, weight, height, stride length, and avatar; along with calories, distance, food, steps, elevation, and sleep. The Plug-in also includes a data type called FB_FitbitDay to encapsulate the required information.
You need to create an app in Fitbit under developer.fitbit.com and generate the necessary authentication key and authentication key secret along with consumer key and consumer key secret.