All of them manually opted in. One vendor was using Zeus before square made it easier.
Another I convinced to turn on the week prior, knew very little of bitcoin before that, until I explained to him why I live on Bitcoin.
It’s my understanding that the default option is only available to vendors who have that tablet with a customer facing screen that shows a Cash App QR code. But the QR code is a secret lightning invoice too. But they would have had to update their firmware.
@jack deserves much respect. Today my wife and I spent the entire day going to shops around town paying in #bitcoin. We bought eggs, coffee, and wine. All with real money, all using square terminals.
Tools like this are vital to the health of this network.