ParLevel Systems: San Antonio startup rolls out mobile wallet technology

Parlevel Systems Inc., a local vending machine technology startup, rolled out more of its shelf check-out system for fresh food markets. The San Antonio-based startup's engineers built a proprietary mobile wallet application called koin that can be used at stand-alone kiosk markets to buy goods without cashiers. The koin app can even be used to buy things without a kiosk. The koin virtual wallet doesn't charge transaction fees, something that micro market and vending machine operators otherwise...