A simple HTTP GET request is used to retrieve the layouted version of the passed graph. You can just perform your own request to the correct URL and pass all required information as URL parameters. However, as we might change internal APIs we recommend you to use the (very small) wrapper implementations we provide for a specific language. We do not provide a wrapper for each language, feel free to write your own and contact us so we can add it to the list below.
Each zip archive contains the wrapper class you can use to call our service as well as a small example illustrating the usage pattern for the specific language.