Great question. I have thought about this as well. I often go to local farmers markets and I would like to start orange pilling them one by one.
Discussion
We used a variety of software wallets or payment apps to accept BTC while doing farmers markets. Strike, CashApp. Or just used QR codes printed out and laminated. That being said, my wife or I was always there to do the transaction. If there were employees in the mix it would be different.