Authentication Action Plugin#

Authenticator action plugins are used to provide both:

• A required authentication action via the getAuthenticationAction() function.
• An optional back-channel authentication action via the getBackchannelAuthenticationAction() function.

Note that both getAuthenticationAction() and getBackchannelAuthenticationAction() methods return the same AuthenticationAction interface, so it is common for the same class to be both a front-channel (regular) authentication action and a back-channel action.