Hi, I'm Akhil. I have few question about Authentication and AuthZ in my rest APIs. I have REST APIs that would be accessed by an Android App, iOS app and web platform. The user will login via otp. Once the user logs in then they can access certain APIs. Shall I implement OAuth2 in this case. Given there are not roles involved, should only authentication will do here? in OAuth2.0 auth via openId is not recommended for access user cases. Also it would help how people are doing it if there is no third party involved