The question might be common but didn't find it anywhere. I'm tracking events in google analytics via measurement protocol. On the analytics page I can create up to 20 events. Let's say I got an invoice and there are 20 sources from where it may come, I need to send that data to analytics, so let's say category invoice action pay and the label is bank transfer, cash etc. I heard label can be left empty on the analytics event manager page, and still if I fill the label in my code It will be shown. I hope I stated myself clear enough :)
Cheers!