I didn't know about the discounts when paying with CC. A lot of shops here offer discounts when paying with cash. It violates rules of card processing companie

I didn't know about the discounts when paying with CC. A lot of shops here offer discounts when paying with cash. It violates rules of card processing companies - or rather, they would violate them to charge more for card transaction, so the stores would just say "3% discount on all purchases, unless paid by card".