SMS based One time OTP has become a very acceptable additional factor of authentication method these days.
RBI soon will be proposing a principle-based framework for authentication of digital payments.
Read More for updates
https://bfsi.economictimes.indiatimes.com/news/fintech/rbi-proposes-framework-for-authentication-of-digital-payments/107513979?utm_source=top_story&utm_medium=homepage