This can be done with direct response ads. What are direct response ads? Direct response advertising enables you to track results from each ad by using coupon codes, unique url's or other means of tracking. In most cases you would tell the listening audience to use a coupon code or give them a direct url to order. Now you can measure how many coupon codes were used or how many people visited your unique link. A great way to track conversions and check your ROI(Return on investment).