The Search API has a query parameter named author that allows to retrieve add-ons given a comma-separated list of author username: https://addons-server.readthedocs.io/en/latest/topics/api/addons.html#search.

An issue reported on addons-frontend highlighted the fact that usernames changed (sometimes) and that using username was not always ideal.

It would be more reliable to pass a list of author IDs, so can we have either a new query parameter OR allow numeric IDs in the existing author parameter?