Discover the Duet Credit Card for UPI payments. Learn its features, cashback, and rewards benefits that make your digital transactions smarter and more rewarding. RBL Duet Credit Card – features, cashback, reward points, annual fees, and eligibility. Compare benefits and apply with ease. Duet Credit Card is a 2-in-1 product that works as a credit card and Xpress Cash. It offers flat cashback, movie and fuel benefits, and a lifetime free annual fee. Duet is a lifetime free credit card from RBL Bank, with easy to understand direct cashback benefits. The card provides a flat 1% cashback on all online and offline spends with no upper limit. Duet ...