QR Payment System for EV Charging Stations Killswitch is the easiest way to transform your EV Charging Stations into an energy sales point. The customer simply needs to scan the QR code, choose the charge duration and pay using a credit card. Using the latest smart switch technology, our ready-to-use cloud platform automatically controls the EV Charger energy supply over the period paid for by the customer. And best of all, the Killswitch payment system is free to use. No monthly subscription or recurring costs, only a small card processing fee per sale - just like other payment providers.