The claim closely matches the wording and substance of Reuters’ article, "Exclusive: Indian refiners pay for Iran oil in yuan via ICICI Bank, sources say | Reuters," which explicitly states that Indian Oil and Reliance bought Iranian crude cargoes under a temporary U.S. sanctions waiver and that payments were made in Chinese yuan via ICICI Bank’s Shanghai branch. This is independently echoed by "Indian refiners pay for Iranian oil in yuan via ICICI - Reuters | Iran International," which reproduces the same Reuters-reported details. I found no fetched source contradicting these core facts.