To answer your question, yes, it is possible to implement other OAuth2 authorizations, such as Facebook, LinkedIn or Twitter.
Here's an example with code examples on how to do this.
In short, you must implement your own Authenticator and update @Api to enable a custom authenticator.
@Api(name = "example", authenticators = { CustomAuthenticator.class })
For more information on user authenticators, see the Google documentation .
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