From Joomla! Documentation
Authentication events are triggered during the user authentication process. This list gives a brief description of each event, what their parameters are, and some examples of their use in core plugins.
This event is triggered to verify that a set of login credentials is valid.
Array of credentials. Structure:\\ ['username']\\ ['password']\\ Alternative authentication mechanisms can supply additional credentials.
An array of JAuthenticationResponse objects detailing the results of each called plugin, including success or failure.
Used in files