The main interface to the API is the IComputeApiClient and the ComputeApiClient implementation.
Connecting to a public cloud
NetworkCredential credential = new NetworkCredential("user", "password");
IComputeApiClient client = ComputeApiClient.GetComputeApiClient(KnownApiVendor.DimensionData, KnownApiRegion.Australia_AU, credentials);
IAccount account = await client.Login();