Discourse has messed up the link, so maybe you are not able to read the circular. It is linking main page instead of circular. I can see that e-mandate and mandate on card is also mentioned. NACH e mandate is the same right?
https://rbi.org.in//Scripts/NotificationUser.aspx?Id=12570&Mode=0
" in terms of which relaxation in Additional Factor of Authentication (AFA) was permitted while processing e-mandates / standing instructions on cards, Prepaid Payment Instruments and Unified Payments Interface, for subsequent recurring transactions with values up to ₹15,000/-, subject to conditions listed therein."
…
"decided to increase the limit from ₹15,000/- to ₹1,00,000/- per transaction for the following categories: (a) subscription to mutual funds, "