API authoriztion information

I have an existing app named “Nifty Dashboard” using V2 APIs.
I want to use the V3 endpoint /v3/historical-candle/intraday for NIFTY 50 candles from Google Apps Script.
Currently I get the error UDAPI100060 Resource not Found.

Can you please confirm:

  1. Is V3 API enabled for my account?

  2. If not, how can I activate/enable the V3 APIs?

  3. Do I need to create a new V3 app, or can you enable V3 for my existing app?