Blender 2.78 came with a perhaps overlooked feature with the Blender ID authentication add-on. It's very strait-forward to use as long as you have registered a Blender ID, but I don't see how it can be very useful to third-party developers like the release notes claim.
Blender 2.78 features the official Blender ID add-on, which allows you to be logged-in within Blender so that other (3rd party) add-ons can provide you with a more tailored experience.
I can't find any material about how to incorporate this into a third-party add-on (except for the Blender Cloud add-on which really isn't even third-party).