Man pages matching name lwp::authen::oauth in section 3pm:

LWP::Authen::OAuth.3pm.en	debian 10 / liblwp-authen-oauth-perl
LWP::Authen::OAuth.3pm.en	debian 11 / liblwp-authen-oauth-perl
LWP::Authen::OAuth.3pm.en	debian 12 / liblwp-authen-oauth-perl