<prompt> Human: I was at a restaurant last night that refused to use Discover credit card. Obviously, I inquired why. Apparently the 5 cash back they offer is taken from the merchants, not reduced from Discovers profits.As someone who shops at a lot of small businesses, this really bothers me. Is anyone out there able to verify this claim? Has anyone else heard something similar?  <response>: Discover doesnt charge extra interchange for the 5 cash back. That merchant is an idiot. 