The Verifone VX 520 terminal uses the SoftPay application for transaction processing, requiring specific menu navigation for sales, voids, and administrative tasks. Core procedures include selecting "Sale" (F2) for transactions, manually keying cards, processing voids via the F4 menu, and utilizing the "1 alpha alpha 66831" password for administrative functions. For comprehensive instructions, including setup, maintenance, and troubleshooting, visit the First Payment Merchant Services PDF guide . Vx520 instructions and help - VizyPay