I want to know how to use services in a drupal commerce site in order to use it as a web service in my iphone app, actually I've already used views data source module to get a JSON document of my products.However I'd like to connect my app in order to log in, create a commerce order and the most important functions of a drupal commerce site.

I've found a lot of information about services like Commerce Services resources module (https://drupal.org/project/commerce_services), which enables all I mention before, but there's no an example or information how to use it. So I hope somebody can help me I'd be really thankful.