I just saw some company's promo campaign on Twitter. It has one promo code on the ad, and it has a deadline to redeem it. I wonder how we could set up the similar campaign.
Our current contact-us form has a custom text field, but the backend is not checking whether the code is valid (not misspelled) or is still effective. (You know, if you go to some retailer website and enter the coupon code, sometimes the form replies immediately that the code is valid or not.)
FYI, our Marketo package doesn't have the referral offer function (I mean this one Use Promo Codes for Offer Fulfillment - Marketo Docs - Product Docs).