Magento site - install affiliate tracking code

I need help installing a specific affiliate tracking code. The site I am working on uses a couple different affiliates and I have successfully implemented one already on the checkout/[login to view URL] and checkout/multishipping/[login to view URL] pages. However, the 2nd code requires more information such as: - the Item IDs of the items in the order. These also need to show the “parent” item ID if it is a sub-item of a configurable product - the customer’s billing state and billing country