Exactly what does Picnik post when exporting

Hi,

I'm trying to write a c# back-end to receive images from Picnik via the API. I have the following to post an image (import);

Code:

  <form id="form1" runat="server" action="http://www.picnik.com/service/" method="post" enctype="multipart/form-data">
    <div>

    <input type="hidden" name="_apikey" value="myKeyHere" />
<input type="hidden" name="_import" value="imagedata" />
<input type="hidden" name="_export" value="http://myURLHere/picnik.aspx" />
<input type="hidden" name="_host_name" value="idcdemo3" />
<input type="hidden" name="_export_agent" value="picnik.com" />
<input type="hidden" name="_export_field" value="POST" />

<input type="file" name="imagedata" />
<input type="submit" value="Import!" /> 
    </div>

I then have a script picnik.aspx which will accept the data posted to it by Picnik when exporting. However, I could not find anything in the API documentation detailing exactly what Picnik posts to the specified page.

Can anyone tell tell me / point me to a page in the documentation?

Thanks

Picnik sends the image data back to you using "multipart/form-data" encoding.  This will look just like somebody had filled in a web page form with the data you'd like.  The image data is stored in the field that you specify with the _export_field parameter.