Pamac packages with no source pkgbuild

Where can I find the pkgbuild for brave-browser?

Clicking Details > Package Source: returns the following broken link

This is the code for brave but not the PKGBUILD which produces the repo version.

The packages link: brave-browser points to the linked error message.

The actual link is here: Packages / Community / brave · GitLab
(it’s called brave, not brave-browser)