I was first going to say how's that the CC #s from my web form are not hitting my server, but then looked at your Docs - and what you did is ingenious - the form is mine, but it is submitted to your site.

The curl example on the front page is rather misleading. It was the only thing I actually read through on that page and I walked away with an impression that that code snippet needs to go to my server. Just the 2c worth of UX feedback :)