When you Tasting Room staff process the order for the 2 for 1 wine tasting/free wine tasting using a coupon presented by a customer, ensure they type the location/source of the coupon into the "Source Code" field in WineDirect's Additional Order Info.
Use the following report to show you the sales attributed to each of those sources and know whether and who is handing out your coupons!
01- DTC Overview > Sales & KPI > 12- Sales by Day and Source Code