* fires when a user successfully registers via frontend registrar, i.e. if the user is created in the system; this **does not** mean that the user is activated / able to log in at that point in time!
* fires when a user successfully registers via frontend registrar, i.e. if the user is created in the system; this **does not** mean that the user is activated / able to log in at that point in time!
*`$registrarType` is the PHP class of the respective registrar that was used
*`$registrarType` is the PHP class of the respective registrar that was used