And if you want to be focused purely on the bottom line; conversions were just as high without it automatically filled in but coupon usage was notably lower; meaning automatically filling in the coupon was just giving away money.
A also suspect this is why when you Google "landsend coupons" the #1 site is a UGC coupon-sharing site and #2 is the merchant's own site. By every traditional measure, the merchant's page should outrank the coupon site.
Why would you trust a coupon sharing site more? The merchant has an incentive to only give you some token discount, whereas the "crowd" has no such incentive. So you're more likely to trust the crowd in this scenario.
What are you filling it in with and what type of discount did the coupon apply to the purchase?
So are you saying that for the purposes of testing you took a loss on the sale in order to see if there was abandonment?
We did not take any losses.