Originally Posted by
cdancer20
No you do not need to use a Discover card when using ShopDiscover. I have used other cards multiple times and had no problems tracking. HOWEVER, if you're order does not track, you more than likely will not be able to convince Discover to still payout since they can argue that you failed to follow the T&C. So it's use at your own risk but yes theoretically the order will still pay out regardless of what credit card you use.
This has been my experience as well.