OAuth 2.0 is an authorization mechanism, it's ,mainly used for issuing access token. There are 4 ways to obtain access token as per RFC 6749.Authorization codeImplicitPasswordClient credentialsThe third party application must obtain a client id and client secret from the target service before obtaining access token no matter which method to use. This is to prevent token to be used maliciously.Authorization codeWith this method, the third party application must first get an authorization code and then use this authorization code to exchange the access token. This is the most commonly used metho...