Hi,
Just wanted to share my badge counter for Things 3 (Today view), nothing fancy but might give some help to new people like me.
Thanks to @GoldenChaos for telling me how to do it 
( Maybe this badge counter could be implemented into GC so I don't need to re-add it each time I update? )
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Created a copy of the default badge counter for Tumblr (don't think it matters which one you pick) and renamed it to Things.
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Edited the Advanced configuration and changed all references of "Tumblr" to "Things"
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Edited the "Predefined action" script and changed all references of "Tumblr" to "Things3" except for the UI element line where it is referenced to "Things".
Added the following line which openes the "Today view" in Things when pressing the Touch Bar button each time.
if application "Things3" is running then
tell application "System Events"
tell process "Dock"
try
click UI element "Things" of list 1
key code 19 using { command down }
end try
end tell
end tell
else
tell application* "Things3" to activate
end if
As I said, nothing special but might help newcomers to setup their own stuff
