PHP ends up being easier to deal with than node in terms of securing my API secret key. Node solution didn't work out for me for several combined reasons. PHP would be more ideal since I can stick it on the same server, but off the www public dir to run the commands. That's just easy.
I'd also like to see a PHP SDK. I need to run leader boards for our environmental app and it'd be good for the public to check in.
I'd also like to see a PHP SDK, or more specifically some docs related fetching some user data into an Drupal site periodically.