Which of the following statements is/are correct?

A. In March 2024, The National Payments Corporation of India (NPCI) allowed One97 Communications (OCL), which operates brand Paytm, to function as a third-party application provider (TPAP) on the Unified Payments Interface (UPI).
B. Four banks - State Bank of India, Axis Bank, HDFC Bank, and YES Bank - will act as payment service providers (PSPs) to Paytm.
C. The NPCI said HDFC Bank would operate as a merchant acquiring bank for existing and new UPI merchants for OCL.