I have seen many run it as an ATM transaction rounded to the nearest dollar and refund the change in cash. I saw this in two states.

Having said that. I love cash only businesses. Visa and the other CC companies have way too much power. We should all go back to cash tomorrow, but we won’t.

I ran a business, not weed related, that was cash only for the better part of 5 years. When I started taking cards I made sure cash and bitcoin were also options. The only downside was going to the bank every week to grab stacks of small bills for change. The upside was never having to deal with credit cards and every payment settling instantly when the cash changed hands. Under $100, cash is king.