Develop two php scripts that can be run as a cron job
1) download clickbank's product listings' zipped xml file from their website, unpack the zip, and put all the contents of the xml file into a mysql database, updating existing entries (if any) and adding the new ones.
2) same for the [url removed, login to view] database, but data to be stored in a separate table or, if combined with the clickbank table, a column needs to specify the source
Prefer a fully normalized database where possible. Winning bid will get first crack at the next phase of the project which involves creating queries for the database, a php webservice (or similar) and querying the web page/service from c# (.net)
I expect this has already been done before and I believe clickbank used to have instruction on how to download and unzip their list (written in php)