"Dave Balderstone" wrote

The credit card companies make that impossible for the merchant. Give a
cash discount, you can't accept our card.

Some, like Canadian Tire, get around it by using coupons, etc (ie:
CanTire Money) to non-credit card customers.

Here (US) you cannot charge more for a CC but you can discount for cash.
There are a couple of businesses I patronize to get the discount.