I don't know much about online coupons but I was told by a market that they do not not accept online coupons.
The only ones that they accept are the ones from the Sunday newspaper.
I love Pizza Hut - in fact I am a member of the VIP Club. I get free coupons each month and in order to use a free coupon I have to buy 2 large pizzas.
They also send me free coupons for their baked cinnamon sticks. They are wonderful.