Automate OAuth2

Question

Good morning,

I'm working on a project where I've to connet to a provider server. This server uses OAuth2 techmology for authentication. You can find the sandbox example here http://sandbox.ihealthlabs.com/contentfiles/files/SandboxAPISample.zip and you can use the credentials [email protected] with password 111111 .

OK, this example allows you to access and view the informations with an user but I want to make a log-like page where I will make access and extract the datas of many users and update an our database.

But I don't know where to start.
I found some libraries and examples but always for Facebook, Twitter etc...

The only documentatios that I have is the pdf inside this zip file http://developer.ihealthlabs.com/contentfiles/files/Open%20API%20Protocol.zip

Please, can you help me?

Thank you