According to the website:
STAR, an ATM in Tucson, AZ, is a full-service debit payment network that is focused on offering a range of convenient and secure transactions such as digital wallets, ATMs and point-of-sale. As a Fiserv company, they offer decades of experience and innovative solutions to ensure their clients are ready for the next generation of commerce technologies. Serving over 115 million debit cardholders from more than 2,800 issuers, STAR Network provides comprehensive suite of point-of-sale, e-commerce, card-not-present debit, ATM and funds transfer services.