Offer codes should be valid even if there is no cost to the initial appt. Offer codes are a vital way to track where your customers are coming from as well. Some of us do not charge a consult fee, so if a new customers sees an offer on instagram and clicks to book an appt and wants to redeem that offer, but the book a consult to talk about it first, we have no way of tracking that the specific offer is what brought them in. This seems like a simple fix, we currently have the option to use it as a discount off a dollar amount off can you just add a drop down that says no value- and remove the feature on the back end that forces it to be about zero to apply?