I'm using Force.com sites to integrate Wordpress and Salesforce.
I've created a VF page called Subscriber with information like Name, Email, Zip. I've added this into an iframe in a Wordpress site. I need to pass additional information from the Wordpress site (i.e. Product to which the user is subscribing) to VF page and then save it as a Salesforce Contact Information to be saved is Name, Email, Zip, Product. How do I do this?
(The issue is I'll have multiple products to which a user can subscribe to and I can't create different VF pages to include into Wordpress)