Using RPR to measure the overall effectiveness of your email flows and campaigns is likely a better strategy here than solely using it as a lever to determine discount effectiveness. For instance, what if you offer no discounts, does the RPR become obsolete? It still remains as a baseline indicator of success for that flow, campaign or account. I think it better from a business perspective for discerning discount effectiveness to quantify the gross sales provided through a coupon code minus the total dollar value in discounts for that code over a given period of time (as well as subtracting any ad costs surrounding the offer), that way you can see “apples to apples” how effective your code and promotion is for your bottom line, vs relying on klaviyo metrics to tell you. Just my thoughts though. RPR is a baseline indicator of message efficiency, not a crystal ball into discounting, unfortunately