eBay Sellers API help

I am a PHP developer and I have used many APIs before, but I'm stuck on eBay's seller API. I have not been able to get the token authorisation to work. I just need some examples, specifically: Retrieve orders Use the sandbox and production Getting started with the token authorisation I am using the Australian eBay website (which should not make a difference, but anyway) I currently have a seller's account in production.