Accessing vCloud REST API with Powershell

Hello,

     I have come to the conclusion that the new vCLoud cmdlets are not enough for what I plan on doing, and I plan to extend upon the cmdlets by using the API via REST. I have been fiddling with Invoke-RestMethod a bit, but I cannot seem to get the syntax to work despite reading the pdf regarding vCloud API Programming. Can anyone give me a generic start into this? Thanks!