I feel inadequate trying to help you Brian, but I'll add my 2 cents. Here's a couple ways we've grabbed this since migrating to at.js
1. Grabbing it through the cookie.
getCookie('mbox') gives you session and PCID. We just parse out the value we need.
![1456882_pastedImage_4.png 1456882_pastedImage_4.png](/t5/image/serverpage/image-id/10780i5EE32173DBECC4C7/image-size/large?v=v2&px=999)
2. define a variable in the html offer with '${user.PCID}' and the grab it once the offer loads.
Also, what is the use case that you'd be trying to accomplish with this?