With the latest commit (93788e5) of libuplink I get the message “rpc error: code = Unauthenticated desc = rpc error: code = Unauthenticated desc = Missing API credentials” when trying to call project_salted_key_from_passphrase with my Project and my secret. The same coding works with a previous commit (like d65386f).
Seems something changed internally Which leads to issues when using libuplink.