How about when a store gives back points on the receipt?
For example, something bought from Sears which gives SYWR, would they deduct the rewards? (they have some items with 100% back in points).
The T&C say "Product rebates, discounts or money received from lowest price comparison programs will be deducted from the original cost of the item". So that makes me think perhaps they would subtract it, particularly if it is shown on the receipt. I recently bought a grill for $300 and Sears gives $300 back in points, but split into 12 monthly payments that I may never see or have that much value.
How about when Sears throws in, for example $40 in free cash on purchase, and they show the item as $200 but then show $40 paid with this free cash, and $160 then charged to Amex. Would Amex give the $160 back or would they deny it because it wasn't completely bought with the Amex card?