Taken from their Facebook page. Doesn't say you need to show anything, but to just ask for a sample.
Have you tried Clinique Beyond Perfecting Foundation + Concealer yet? Smooth it on and it’s foundation. Spot-apply with the wand and it’s concealer. Visit your nearest Clinique counter for your free 5 Day Sample. (One per customer, while stocks last).
For some reason the app won't let me paste into the deal URL so here is the link to the product on their website.