How to import this plugin properly into my existing complex project?

[xxluky]

What is the correct way to import this plugin? I could'n find it anywhere. I just copy-paste the files from the Unity example project but I get errors.

[zendorx]

Yeah, me too! Notification project should support google play service resolver

[lucid-dreamm]

Yes I need it.
I use support android 25.2.0 for admob etc but it conflicts with 26.1.0

[Hizzy-Sama]

I need this answer too, i'm trying to add notification in a unity game that i do not own, what a mess :'(