Hello guys,
In previous version(s) of Unity code was shared with Unitypackage file.
But in the next version, they use more and more the "Unity package manager".
You can use it by coping that on the manifest.json of unity:
"be.elositreeandtapwithus.tapunitypluginaspackage":"https://github.com/EloiStree/2020_04_25_TapUnityPluginAsPackage.git"
Or by copying the git, here:

I did the project to show your team how to do it.
(Feel free look the fork and make a branch on your official release.)
You can find the example here:
https://github.com/EloiStree/2020_04_25_TapUnityPluginAsPackage