What this tile shows
Half of the ROI question. On its own it flatters a campaign, because it counts the whole order rather than the uplift.
Squizzie calls this one Coupon Order Revenue. It reads as a money figure in your shop currency.
Where the number comes from
WooCommerce Orders. Order data including revenue, counts, and averages.
What you need for it to appear
Nothing beyond Squizzie and the shop data it already reads.