All UPI Operating Circulars (OCs) are uploaded on NPCI website https://www.npci.org.in/what-we-do/upi/circular In case if some circulars are not available on NPCI website then bank may check in URCS portal > Communication > E-Library .Not available ...
For Back office training get in touch with Customer success team, they take monthly training if required will schedule separate time as per availability of bank.