From the home screen, go to the Charge customer option → Enter the products or the amount (which can be added, subtracted, multiplied and divided) → Click Continue → Select Pay by Card if you have multiple payment methods activated → Have the customer tap their card on the NFC-chip in the device. For Surfpay POS app, the NFC-chip is located somewhere on your device. Usually, it's on the back of the device. However, on our SurfpayOne terminal, the location is on the screen, a bit above the center.