Which VIMEO API to use for our needs - web based application to show "tutorial" vidoes

We have a web based system that we are looking at replacing our existing "help system" from uploading flash videos directly to our website to instead "embedding" content we upload to our vimeo account. We have a vimeo pro account and these videos need to be "private" i.e. not accessible to the general public. My question is which API version should I use? And do you have any sample code in say PHP I could take a peek at with the functionality we are after (Our app is written in cold fusion but I can "translate" a php sample).