Lorna Mitchell's Blog: Accessing the Magento V2 API
I must say that I am always pleased when I see that these products do include some kind of API. The Magento one is a bit interesting, although there is some half-decent API documentation for the original API. However they have then released a new version of the API, with very little documentation.
Her example code shows the difference in a call to grab a customer list from the SOAP interface - the version 1 method used a "customer.list" request while the version 2 method just made use of a normal SOAP method call to the "customerCustomerList" method on the service.