"A PCN cannot stop you from setting a minimum dollar amount for accepting credit cards for payment as long as the minimum is the same for all credit card issuers and PCNs, and isn't more than $10.
What's new about that? PCNs sometimes prohibited merchants from refusing to accept a credit card as payment if the customer's purchase didn't exceed a certain amount. For example, if you accepted credit cards at all, the PCNs or banks might have said you had to accept a credit card for even the most minimal purchases"
Most people don't know this. I usually just leave the items I was going to buy on the counter if they tell me there's a minimum. Most of the time they'll change their mind and take my card, after first trying to slap me with a $0.50 surcharge that I decline.