I don't know about the popup shop specifically, but the AP 30% off was applied to all of the merchandise I bought last weekend that was on sale. Like the Neon collection and select Food and Wine merch was already 30% off and then I got another 30% off of that discounted price. And the 2020 dated stuff was buy one get one free and the 30% off applied on top of that. I feel like I practically stole the 2020 dated pins...they were marked down to $5 each, also buy one get one, so 2 for $5, then another 30% off of that. So I would think that the AP discount would also apply to merchandise in the popup shop.