5) Merchants Cannot Charge A Surcharge For Using A Credit Card, However, They Can Offer A "Cash Discount"
You may have noticed that gas stations are starting to offer a different, higher price for credit cards. This isn't technically allowed— unless it is marketed as a "cash discount." In other words, if you fill up your car and find that you've been charged more than advertised because you paid with a credit card — that's not allowed. If, however, you decide to pay with cash because you saw an advertised "cash discount" to the "regular price" — that's ok. A subtle distinction, but an important one.