A wireless power transfer system for selectively disabling a transmit antenna of a plurality of transmit antennas when a foreign object is detected is described. The read head includes a first insulator layer. A notification is received from the merchant computer of initiation of a secure transaction process, and then the user computer enters a secure transaction mode of operation and establishes a communication session with a payment provider device. If the scanner is linked to a network, the serial number is transmitted to a documentary file inside a registration center through the net.