I am developing an app and I want to automatically edit product page metatags (Title,Description,Keywords) but I cannot find them in the http://docs.shopify.com/api/product#show product api documentation. Do you know what api is responsible for manipulating the metatags?
As a second question I would like to know if I can create new metatags that are not supported yet from Shopify? Declare my own metatags without having to change the Theme.