Man pages matching name oauth::lite2::signer::algorithm::hmac_sha256 in section 3pm:

OAuth::Lite2::Signer::Algorithm::HMAC_SHA256.3pm.en	debian 12 / liboauth-lite2-perl
OAuth::Lite2::Signer::Algorithm::HMAC_SHA256.3pm.en	debian 13 / liboauth-lite2-perl