I believe it is in the franchise agreement with the correspondent bank of CC company...
We also have a lot of $10 minimum to use credit card merchants here too... but cash isn't King either because they only accept $20 bills and smaller... forget about checks.
The county does charge a hefty fee when paying taxes by Credit Card... figure they must have a deal that allows this.
Speaking of Credit Cards... I was picking up a food order for a board meeting and asked ahead of time if the establishment accepts Discover... said yes.
I go to pay and the card is declined... said not possible... call Discover and said no charge showing.
Manager comes in and says they do not accept Discover...
Well, we have a problem... $265 of hot and ready to go food and no way to pay for it.
I happened to have my check book with me and that is what we did... but they also do not accept checks... it was either that or walk out... owner said there is an ATM on the corner... but I don't and never have had an ATM...