Well at first if you could, it would be enough to maintain a fork of the branch that interests you and use that to see it.
Regarding the database, you could use atlas if you wish, it is also a free option. However, it will not work quite well due to the limitations of the service, although if it is for development and testing it could work (although I recommend using it locally for that purpose)
Integrating ExoBucks with NodeBB
We're considering creating a plugin for ExoBucks.
Thanks for opinions!
@exobucks Best bet is to integrate the js code in your plugin itself, so all admins have to do is enable your plugin and that's that.
In your plugin you can execute your code in a client-side js file, and read the value of a configured ID from the plugin settings (if needed). You can see how this is done by inspecting how the Google Analytics plugin handles it: