One month back, only one small lounge was working and was accepting diners, axis and kotak cards. Some visa signature cards also were there, but wasn't mentioned full list.
Went today again to domestic t2 lounge. Now the ground floor (actually 3rd floor) lounge is closed and 4th floor is operating. It's pretty big and good enough to handle current crowd, as indigo is still in T1, which is 70-80% of traffic in Bangalore.
Lounge is beautiful with garden vibe and plenty of choices in food items.
Used my Infinia. I guess most cards are accepted, as this is the only lounge in T2.