United States of America Maestro is a PIN-based debit card network closely related to the Cirrus ATM network, also owned by Mastercard. Like other PIN-debit networks in the U.S., Maestro there relies solely on a standard card and PIN, without a chip; signature-debit transactions in the U.S. are handled through the main Mastercard network or the rival Visa network. RBS's former U.S. subsidiary, Citizens Financial Group, switched to Visa, though like most foreign banks with operations in the United States, it used MasterCard's Cirrus network and the card participated in the Mastercard SecureCode initiative.