Where do you go to add it? I went to the promo code page and it says there was an error adding it. The rewards page has no spot to add it.
Now I found a different code page
https://www.sideshow.com/code but it says "The code WCPFJJM7SYAKHAWPU has hit it usage limit."
EDIT: I've now learned that the code is getting added for people despite it saying that it hit its limit.