Man pages matching name lwp::authen::oauth2::serviceprovider::line::accesstoken in section 3pm:

LWP::Authen::OAuth2::ServiceProvider::Line::AccessToken.3pm.en	debian 11 / liblwp-authen-oauth2-perl
LWP::Authen::OAuth2::ServiceProvider::Line::AccessToken.3pm.en	debian 12 / liblwp-authen-oauth2-perl