How to delete a google apps script service

Find the URL to the script url in the script editor i.e:

https://script.google.com/macros/d/MS3-PFwnUdYw7_bQF3y8BJte_1Q7n6BNa/edit

Remove edit from url and replace with manage/uninstall

https://script.google.com/macros/d/MS3-PFwnUdYw7_bQF3y8BJte_1Q7n6BNa/manage/uninstall

Click uninstall and that should be it!

Strange. Maybe, Try checking if the trigger is still there:

Open a spreadsheet then go to Tools -> Script Editor, then on the editor window go to Edit -> All your triggers... and see if the gmail meter method is still listed there. If so, delete it.

After you delete the script, look for it in the trash folder and delete it from there as well. This has worked for me; no other steps are necessary.