Cloaking is actually programmed into the CBPRESS MarketPlace. Note that your product links will always hit a ?gocbp=XX where XX is your Unique CBPRESS product ID. No Affiliate information is contained in this link, but is added when the visitor is redirected to the vendor page.
To Check your link Affiliate ID and Tracking ID if entered, visit a product website from your blog and click the order button. When you get to the ClickBank page, at the bottom of the page your affiliate ID should be visible, along with TID’s that you have added either globally or on a product specific basis.