Carouselchecks.com has a clever PPC strategy. When you click their ad the landing page has this banner message–
This communicates to the ad clicker that the discount was activated by clicking this specific ad (what a lucky coincidence for the clicker). The shopper isn’t told when the coupon code will expire so they’re incentivized to act now (or risk losing the discount)!
The other aspect to notice is notification bar wording. It communicates, “Thanks for clicking our ad, as a sign of appreciation we’ve gone ahead and applied your discount (thus eliminating the need to retype coupon code during checkout.)” That might seem like a trivial detail but it’s a small psychological nudge.