Man pages matching name catalyst::authentication::credential::authen::simple in section 3pm:

Catalyst::Authentication::Credential::Authen::Simple.3pm.en	debian 10 / libcatalyst-authentication-credential-authen-simple-perl
Catalyst::Authentication::Credential::Authen::Simple.3pm.en	debian 11 / libcatalyst-authentication-credential-authen-simple-perl
Catalyst::Authentication::Credential::Authen::Simple.3pm.en	debian 12 / libcatalyst-authentication-credential-authen-simple-perl