Almost but not exactly, any rational merchant would estimate how much they pay monthly in credit card fees and find a way to add that back to their revenue. For most practical cases, the business is started already after the existence of credit cards, so when modeling revenue in your business plan this should already be baked in and the prices you come up with already cover it.

So it doesn't mean they increase the price of every product by 3%. One guy might charge more just for coffee, another do some other thing. But any extra cost you put on a seller of anything, the rational seller will make that back in sales somehow.