I put my cart together pretty much identical to the tutorial. I'm using ecart 4.5 and Authorize.net for the gateway. Everything works great until I click "Submit Order" on the confirm page. No matter what I do or try I'm taken to the checkout failure page. I don't know much PHP but I'm not supposed to with eCart.
If I do everything by the book shouldn't it just work? Any ideas? I have no clue what to do next.