Man pages matching name business::paypal::api::masspay in section 3pm:

Business::PayPal::API::MassPay.3pm.en	debian 10 / libbusiness-paypal-api-perl
Business::PayPal::API::MassPay.3pm.en	debian 11 / libbusiness-paypal-api-perl
Business::PayPal::API::MassPay.3pm.en	debian 12 / libbusiness-paypal-api-perl