I downloaded the API for PHP and look into the source.
It seems that all you need to do is generate an API key and secret key in your DivShare welcome page.
With those in hand you can use LWP (or WWW::Mechanize, but I don't know this module) to post a request to:
The server will respond with an XML that will have your SESSION_KEY.
Then, from the API documentation, you must request for an UPLOAD_TICKET. Another post:
Parse the XML for the upload ticket and build the form as shown in http://www.divshare.com/integrate/api#uploading
Are you posting in the right place? Check out Where do I post X? to know for sure.
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Want more info? How to link or
or How to display code and escape characters
are good places to start.