I was part of a private party booking the whole place. Patio gives you a card to "facilitate" the order of drinks and payment. The barman will click on your card every time you order a drink so they dont charge you to make a faster service. You pay at the exit. This is how their scam works:they "scan" your card and then tell you how much you have to pay for the drinks you have, but they will charge you for more drinks yiu actually had. If you challenge, they refuse to double check the card and their security guards will not let you get out of the premises if you refuse to pay. Patio are professional scammers. It was just one extra drink, so I guess most people do not challenge. Avoid this place!!