During my research on how to implement a solution for filtering commits on bitbucket's git repo, i.e. rejecting pushes that introduce invalid changes, I found out about bitbucket's custom plugins and allegedly you can implement custom hooks as java apps that you can connect with bitbucket's git repo. One example: https://blog.developer.atlassian.com/beer-o-clock-stash-plugin-tutorial/.
In this example plugin is used as a part of the custom "Stash" server that is run on the localhost. My question is: could that same custom plugin be used on an existing bitbucket remote repo somehow, and can you point me in a right direction on how to achieve that?